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The causes of World War II have been given considerable attention by historians. The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes. Primary themes in historical analysis of the war's origins include the political takeover of Germany in 1933 by Adolf Hitler and the Nazi Party; Japanese militarism against China, which led to the Japanese invasion of Manchuria and the Second Sino-Japanese War; Italian aggression against Ethiopia, which led to the Second Italo-Ethiopian War; the Soviet Union's desire to reconquer old territories of the Russian Empire, which led to the Soviet invasion of Poland, the Soviet occupation of Bessarabia and Northern Bukovina, the occupation of the Baltic states and the Winter War.
During the interwar period, deep anger arose in the Weimar Republic over the conditions of the 1919 Treaty of Versailles, which punished Germany for its role in World War I with heavy financial reparations and severe limitations on its military that were intended to prevent it from becoming a military power again. The demilitarisation of the Rhineland, the prohibition of German unification with Austria, and the loss of its overseas colonies as well as some 12% of its pre-war land area and population all provoked strong currents of revanchism in German politics.
During the worldwide economic crisis of the Great Depression in the 1930s, many people lost faith in liberal democracy and countries across the world turned to authoritarian regimes.[1] In Germany, resentment over the terms of the Treaty of Versailles was intensified by the instability of the German political system, as many on both the Right and the Left rejected the Weimar Republic liberalism. The most extreme political aspirant to emerge from that situation was Adolf Hitler, the leader of the Nazi Party. The Nazis took totalitarian power in Germany from 1933 and demanded the undoing of the Versailles provisions. Their ambitious and aggressive domestic and foreign policies reflected their ideologies of antisemitism, unification of all Germans, the acquisition of "living space" (Lebensraum) for agrarian settlers, the elimination of Bolshevism and the hegemony of an "Aryan"/"Nordic" master race over "subhumans" (Untermenschen) such as Jews and Slavs. Other factors leading to the war included the aggression by Fascist Italy against Ethiopia, militarism in Imperial Japan against China, and Military occupations by the Soviet Union.
At first, the aggressive moves met with only feeble and ineffectual policies of appeasement from the other major world powers. The League of Nations proved helpless, especially regarding China and Ethiopia. A decisive proximate event was the 1938 Munich Conference, which formally approved Germany's annexation of the Sudetenland from Czechoslovakia. Hitler promised it was his last territorial claim, nevertheless in early 1939, he became even more aggressive, and European governments finally realised that appeasement would not guarantee peace but by then it was too late.
Britain and France rejected diplomatic efforts to form a military alliance with the Soviet Union, and Hitler instead offered Stalin a better deal in the Molotov–Ribbentrop Pact of August 1939. An alliance formed by Germany, Italy, and Japan led to the establishment of the Axis powers.
Europe
Asia
Italian invasion of Ethiopia (1935)
The Second Italo-Ethiopian War, also referred to as the Second Italo-Abyssinian War, was a war of aggression waged by Italy against Ethiopia, which lasted from October 1935 to February 1937. In Ethiopia it is often referred to simply as the Italian Invasion (Amharic: ጣልያን ወረራ, romanized: Ṭalyan warära; Oromo: Weerara Xaaliyaanii), and in Italy as the Ethiopian War (Italian: Guerra d'Etiopia). It is seen as an example of the expansionist policy that characterized the Axis powers and the ineffectiveness of the League of Nations before the outbreak of the Second World War.
On 3 October 1935, two hundred thousand soldiers of the Italian Army commanded by Marshal Emilio De Bono attacked from Eritrea (then an Italian colonial possession) without prior declaration of war.[2] At the same time a minor force under General Rodolfo Graziani attacked from Italian Somalia. On 6 October, Adwa was conquered, a symbolic place for the Italian army because of the defeat at the Battle of Adwa by the Ethiopian army during the First Italo-Ethiopian War. On 15 October, Italian troops seized Aksum, and an obelisk adorning the city was torn from its site and sent to Rome to be placed symbolically in front of the building of the Ministry of Colonies.
Exasperated by De Bono's slow and cautious progress, Italian Prime Minister Benito Mussolini replaced him with General Pietro Badoglio. Ethiopian forces attacked the newly arrived invading army and launched a counterattack in December 1935, but their poorly armed forces could not resist for long against the modern weapons of the Italians. Even the communications service of the Ethiopian forces depended on foot messengers, as they did not have radio. It was enough for the Italians to impose a narrow fence on Ethiopian detachments to leave them unaware of the movements of their own army. Nazi Germany sent arms and munitions to Ethiopia because it was frustrated over Italian objections to its attempts to integrate Austria.[3] This prolonged the war and sapped Italian resources. It would soon lead to Italy's greater economic dependence on Germany and less interventionist policy on Austria, clearing the path for Adolf Hitler's Anschluss.[4]
The Ethiopian counteroffensive managed to stop the Italian advance for a few weeks, but the superiority of the Italians' weapons (particularly heavy artillery and airstrikes with bombs and chemical weapons) prevented the Ethiopians from taking advantage of their initial successes. The Italians resumed the offensive in early March. On 29 March 1936, Graziani bombed the city of Harar and two days later the Italians won a decisive victory in the Battle of Maychew, which nullified any possible organized resistance of the Ethiopians. Emperor Haile Selassie was forced to escape into exile on 2 May, and Badoglio's forces arrived in the capital Addis Ababa on 5 May. Italy announced the annexation of the territory of Ethiopia on 7 May and Italian King Victor Emmanuel III was proclaimed emperor on 9 May. The provinces of Eritrea, Italian Somaliland and Abyssinia (Ethiopia) were united to form the Italian province of East Africa. Fighting between Italian and Ethiopian troops persisted until 19 February 1937.[5] On the same day, an attempted assassination of Graziani led to the reprisal Yekatit 12 massacre in Addis Ababa, in which between 1,400 and 30,000 civilians were killed.[6][7][8] Italian forces continued to suppress rebel activity until 1939.[9]
Italian troops used mustard gas in aerial bombardments (in violation of the Geneva Protocol and Geneva Conventions) against combatants and civilians in an attempt to discourage the Ethiopian people from supporting the resistance.[10][11] Deliberate Italian attacks against ambulances and hospitals of the Red Cross were reported.[12] By all estimates, hundreds of thousands of Ethiopian civilians died as a result of the Italian invasion, which have been described by some historians as constituting genocide.[13] Crimes by Ethiopian troops included the use of dumdum bullets (in violation of the Hague Conventions), the killing of civilian workmen (including during the Gondrand massacre) and the mutilation of captured Eritrean Ascari and Italians (often with castration), beginning in the first weeks of war.[14][15]
Spanish Civil War (1936–1939)
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The Spanish Civil War (Spanish: guerra civil española)[note 1] was a military conflict fought from 1936 to 1939 between the Republicans and the Nationalists. Republicans were loyal to the left-leaning Popular Front government of the Second Spanish Republic, and consisted of various socialist, communist, separatist, anarchist, and republican parties, some of which had opposed the government in the pre-war period.[16] The opposing Nationalists were an alliance of Falangists, monarchists, conservatives, and traditionalists led by a military junta among whom General Francisco Franco quickly achieved a preponderant role. Due to the international political climate at the time, the war had many facets and was variously viewed as class struggle, a religious struggle, a struggle between dictatorship and republican democracy, between revolution and counterrevolution, and between fascism and communism.[17] According to Claude Bowers, U.S. ambassador to Spain during the war, it was the "dress rehearsal" for World War II.[18] The Nationalists won the war, which ended in early 1939, and ruled Spain until Franco's death in November 1975.
The war began after the partial failure of the coup d'état of July 1936 against the Republican government by a group of generals of the Spanish Republican Armed Forces, with General Emilio Mola as the primary planner and leader and General José Sanjurjo as a figurehead. The government at the time was a coalition of Republicans, supported in the Cortes by communist and socialist parties, under the leadership of centre-left president Manuel Azaña.[19][20] The Nationalist faction was supported by several conservative groups, including CEDA, monarchists, including both the opposing Alfonsists and the religious conservative Carlists, and the Falange Española de las JONS, a fascist political party.[21]
The coup was supported by military units in Morocco, Pamplona, Burgos, Zaragoza, Valladolid, Cádiz, Córdoba, Málaga, and Seville. However, rebelling units in almost all important cities—such as Madrid, Barcelona, Valencia, Bilbao, Murcia, and Almería—did not gain control. Those cities remained in the hands of the government, leaving Spain militarily and politically divided. The Nationalists and the Republican government fought for control of the country. The Nationalist forces received munitions, soldiers, and air support from Fascist Italy and Nazi Germany while the Republican side received support from the Soviet Union and Mexico. Other countries, such as the United Kingdom, France, and the United States, continued to recognise the Republican government but followed an official policy of non-intervention. Despite this policy, tens of thousands of citizens from non-interventionist countries directly participated in the conflict. They fought mostly in the pro-Republican International Brigades, which also included several thousand exiles from pro-Nationalist regimes. Smaller numbers of pro-Republican international volunteer fighters fought in the POUM, the CNT and the UGT.
After the deaths of José Sanjurjo on July 20, 1936, Manuel Goded Llopis on August 12, 1936, and Emilio Mola on June 3, 1937, Franco gradually emerged as the primary leader of the Nationalist side.
The Nationalists advanced from their strongholds in the south and west, capturing most of Spain's northern coastline in 1937. They also besieged Madrid and the area to its south and west for much of the war. After much of Catalonia was captured in 1938 and 1939, and Madrid cut off from Barcelona, the Republican military position became hopeless. Following the fall without resistance of Barcelona in January 1939, the Francoist regime was recognised by France and the United Kingdom in February 1939. On 5 March 1939, in response to an alleged increasing communist dominance of the Republican government and the deteriorating military situation, Colonel Segismundo Casado led a military coup against the Republican government, intending to seek peace with the Nationalists. These peace overtures, however, were rejected by Franco. Following internal conflict between Republican factions in Madrid in the same month, Franco entered the capital and declared victory on 1 April 1939. Hundreds of thousands of Spaniards fled to refugee camps in southern France.[22] Those associated with the losing Republicans who stayed were persecuted by the victorious Nationalists. Franco established a dictatorship in which all right-wing parties were fused into the structure of his regime.[21]
The war became notable for the passion and political division it inspired worldwide and for the many atrocities that occurred. Organised purges occurred in territory captured by Franco's forces so they could consolidate their future regime.[23] Mass executions on a lesser scale also took place in areas controlled by the Republicans,[24] with the participation of local authorities varying from location to location.[25][26]
Japanese invasion of China (1937)
The Second Sino-Japanese War was fought between the Republic of China and the Empire of Japan between 1937 and 1945, following a period of war localized to Manchuria that started in 1931.[27][28] It is considered part of World War II, and often regarded as the beginning of World War II in Asia. It was the largest Asian war in the 20th century[29] and has been described as "the Asian Holocaust", in reference to the scale of Japanese war crimes against Chinese civilians.[30][31][32] It is known in China as the War of Resistance against Japanese Aggression (simplified Chinese: 抗日战争; traditional Chinese: 抗日戰爭).
On 18 September 1931, the Japanese staged the Mukden incident, a false flag event fabricated to justify their invasion of Manchuria and establishment of the puppet state of Manchukuo. This is sometimes marked as the beginning of the war.[33][34] From 1931 to 1937, China and Japan engaged in skirmishes, including in Shanghai and in Northern China. Chinese Nationalist and Communist forces, respectively led by Chiang Kai-shek and Mao Zedong, had fought each other in the Chinese Civil War since 1927. In late 1933, Chiang Kai-shek encircled the Chinese Communists in an attempt to finally destroy them, forcing the Communists into the Long March, resulting in the Communists losing around 90% of their men. As a Japanese invasion became imminent, Chiang still refused to form a united front before he was placed under house arrest by his subordinates who forced him to form the Second United Front in late 1936 in order to resist the Japanese invasion together.
The full-scale war began on 7 July 1937 with the Marco Polo Bridge incident near Beijing, which prompted a full-scale Japanese invasion of the rest of China. The Japanese captured the capital of Nanjing in 1937 and perpetrated the Nanjing Massacre. After failing to stop the Japanese capture of Wuhan in 1938, then China's de facto capital at the time, the Nationalist government relocated to Chongqing in the Chinese interior. After the Sino-Soviet Non-Aggression Pact, Soviet aid bolstered the National Revolutionary Army and Air Force. By 1939, after Chinese victories at Changsha and Guangxi, and with Japan's lines of communications stretched deep into the interior, the war reached a stalemate. The Japanese were unable to defeat Chinese Communist Party forces in Shaanxi, who waged a campaign of sabotage and guerrilla warfare. In November 1939, Chinese nationalist forces launched a large scale winter offensive, and in August 1940, communist forces launched the Hundred Regiments Offensive in central China.
In December 1941, Japan launched a surprise attack on Pearl Harbor and declared war on the United States. The US increased its aid to China under the Lend-Lease Act, becoming its main financial and military supporter. With Burma cut off, the United States Army Air Forces airlifted material over the Himalayas. In 1944, Japan launched Operation Ichi-Go, the invasion of Henan and Changsha. In 1945, the Chinese Expeditionary Force resumed its advance in Burma and completed the Ledo Road linking India to China. China launched large counteroffensives in South China and repulsed a failed Japanese invasion of West Hunan and recaptured Japanese occupied regions of Guangxi.
Japan formally surrendered on 2 September 1945, following the atomic bombings of Hiroshima and Nagasaki, Soviet declaration of war and subsequent invasions of Manchukuo and Korea. The war resulted in the deaths of around 20 million people, mostly Chinese civilians. China was recognized as one of the Big Four Allies, regained all territories lost, and became one of the five permanent members of the United Nations Security Council.[35][36] The Chinese Civil War resumed in 1946, ending with a communist victory and the Proclamation of the People's Republic of China in 1949.
Soviet–Japanese border conflicts
The Soviet–Japanese border conflicts,[37] also known as the Soviet-Japanese Border War, the First Soviet-Japanese War, the Russo-Mongolian-Japanese Border Wars or the Soviet-Mongolian-Japanese Border Wars, were a series of minor and major conflicts fought between the Soviet Union (led by Joseph Stalin), Mongolia (led by Khorloogiin Choibalsan) and Japan (led by Hirohito) in Northeast Asia from 1932 to 1939.
The Japanese expansion in Northeast China created a common border between Japanese-occupied Manchuria and the Soviet Far East. This led to growing tensions with the Soviet Union, with both sides often engaging in border violations and accusing the other of doing so. The Soviets and Japanese, including their respective client states of Mongolia and Manchukuo, fought in a series of escalating small border skirmishes and punitive expeditions from 1935 until Soviet-Mongolian victory over the Japanese in the 1939 Battles of Khalkhin Gol, which resolved the dispute and returned the borders to status quo ante bellum.
The Soviet–Japanese border conflicts heavily contributed to the signing of the Soviet–Japanese Neutrality Pact in 1941.
European occupations and agreements
This is a list of timelines of events over the period of World War II.
War breaks out in Europe (1939–40)
* German Stuka dive bombers on the Eastern Front, 1943
* German soldiers take position near a Sturmgeschütz III on the Eastern Front, 1942
* American soldiers during the Italian campaign, 1943
* Stuka flying over Stalingrad, 1942
* Soviet soldier raising a flag over the Reichstag after the Battle of Berlin, 1945
* Destruction in Dresden after Allied air raids, 1945
The European theatre of World War II was one of the two main theatres of combat[nb 1] during World War II, taking place from September 1939 to May 1945. The Allied powers (including the United Kingdom, the United States, and the Soviet Union) fought the Axis powers (including Nazi Germany and Fascist Italy) on both sides of the continent in the Western and Eastern fronts. There was also conflict in the Scandinavian, Mediterranean and Balkan regions. It was an intense conflict that led to at least 39 million deaths and a dramatic change in the balance of power in the continent.
Throughout the mid-to-late 1930s, Adolf Hitler, the leader of fascist Nazi Germany, expanded German territory by annexing all of Austria and the Sudetenland region of Czechoslovakia in 1938. This was motivated in part by Germany's racial policy that believed the country needed to expand in order for the pseudoscientific "Aryan race" to survive. They were aided by Italy, another fascist state which was led by Benito Mussolini. World War II started with Germany's invasion of Poland on 1 September 1939, and the Soviet Union, led by Joseph Stalin, joined the invasion later that month. They partitioned Poland so the country was split up among the two nations.
Poland's allies, France and the United Kingdom, declared war on Germany days after the invasion of Poland but did not want to actually engage in conflict. This changed after Germany invaded Norway, Denmark, France, the Netherlands, Belgium, and Luxembourg. The six countries were taken over, and Germany began two successive aerial bombardments of the United Kingdom, in the Battle of Britain and the Blitz. British Prime Minister Winston Churchill led his country's war effort. Germany also began a widespread genocide of Jews in the Holocaust. In 1940, Italy invaded Greece, and in 1941, Germany invaded Yugoslavia and Greece. Germany then began an invasion of the Soviet Union, breaking the countries' non-aggression pact, and Germany declared war on the United States after Imperial Japan did so. The United States was led by President Franklin D. Roosevelt.
In 1942, the Soviets stopped further invasion of their country at the Battle of Stalingrad. Meanwhile, the Allies engaged in a mass bombing campaign of German industrial targets. In 1943, the Allied powers began an invasion of Italy, causing the end of Mussolini's regime, but Germans and Italians loyal to the Axis continued fighting. The Allies liberated Rome in 1944. In June 1944, the Allied powers began an invasion of German-occupied western Europe, as the Soviets launched a massive counterattack in eastern Europe in Operation Bagration. Both campaigns were successful for the Alies. In 1945, Roosevelt died and was succeeded by Harry S. Truman. The Soviet Union conquered most of Eastern Europe including the German capital Berlin, as Mussolini was hanged and Hitler committed suicide. Concentration camps that were used in the Holocaust were liberated. Germany unconditionally surrendered on 8 May 1945,[nb 2] although fighting continued elsewhere in Europe until 25 May. On 5 June 1945, the Berlin Declaration, proclaiming the unconditional surrender of Germany to the four victorious powers, was signed.
The Allied powers then moved to finishing the Pacific War against Japan. Once World War II ended, the Allies occupied the continent, giving some countries back to their pre-war leaders or creating new governments, before funding their nations' economic recovery. German military leaders were subject to the Nuremberg criminal trials. Western Europe became a series of capitalist governments and eastern Europe became communist, beginning the Cold War among the former Allied nations. Germany was split into the capitalist West Germany and the communist East Germany.
Western Europe (1940–41)
The Western Front was a military theatre of World War II encompassing Denmark, Norway, Luxembourg, Belgium, the Netherlands, the United Kingdom, France, and Germany. The Italian front is considered a separate but related theatre.[nb 3] The Western Front's 1944–1945 phase was officially deemed the European Theater by the United States, whereas Italy fell under the Mediterranean Theater along with the North African campaign. The Western Front was marked by two phases of large-scale combat operations. The first phase saw the capitulation of Luxembourg, Netherlands, Belgium, and France during May and June 1940 after their defeat in the Low Countries and the northern half of France, and continued into an air war between Germany and Britain that climaxed with the Battle of Britain. The second phase consisted of large-scale ground combat (supported by a massive strategic air war considered to be an additional front), which began in June 1944 with the Allied landings in Normandy and continued until the defeat of Germany in May 1945 with its invasion.
Mediterranean (1940–41)
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Axis attack on the Soviet Union (1941)
The Eastern Front, also known as the Great Patriotic War[a] in the Soviet Union and its successor states, and the German–Soviet War[b] in modern Germany and Ukraine, was a theatre of World War II fought between the European Axis powers and Allies, including the Soviet Union (USSR) and Poland. It encompassed Central Europe, Eastern Europe, Northeast Europe (Baltics), and Southeast Europe (Balkans), and lasted from 22 June 1941 to 9 May 1945. Of the estimated 70–85 million deaths attributed to World War II, around 30 million occurred on the Eastern Front, including 9 million children.[38][39] The Eastern Front was decisive in determining the outcome in the European theatre of operations in World War II, eventually serving as the main reason for the defeat of Nazi Germany and the Axis nations.[40] It is noted by historian Geoffrey Roberts that "More than 80 percent of all combat during the Second World War took place on the Eastern Front".[41]
The Axis forces, led by Nazi Germany, began their advance into the Soviet Union under the codename Operation Barbarossa on 22 June 1941, the opening date of the Eastern Front. Initially, Soviet forces were unable to halt the Axis forces, which came close to Moscow. Despite their many attempts, the Axis failed to capture Moscow and soon focused on the oil fields in the Caucasus. German forces invaded the Caucasus under the Fall Blau ("Case Blue") plan on 28 June 1942. The Soviets successfully halted further Axis advance at Stalingrad — the bloodiest battle in the war — costing the Axis powers their morale and regarded as one of the key turning points of the front.
Seeing the Axis setback from Stalingrad, the Soviet Union routed its forces and regained territories at its expense. The Axis defeat at Kursk terminated the German offensive strength and cleared the way for Soviet offensives. Its setbacks caused many countries friendly with Germany to defect and join the Allies, such as Romania and Bulgaria. The Eastern Front concluded with the capture of Berlin, followed by the signing of the German Instrument of Surrender on 8 May, a day that marked the end of the Eastern Front and the War in Europe.
The battles on the Eastern Front of World War II constituted the largest military confrontation in history.[42] In pursuit of its "Lebensraum" settler-colonial agenda, Nazi Germany waged a war of annihilation (Vernichtungskrieg) throughout Eastern Europe. Nazi military operations were characterised by vicious brutality, scorched-earth tactics, wanton destruction, mass deportations, forced starvations, wholesale terrorism, and massacres. These also included the genocidal campaigns of Generalplan Ost and Hunger Plan, which aimed to the extermination and ethnic cleansing of more than a hundred million Eastern European natives. German historian Ernst Nolte called the Eastern Front "the most atrocious war of conquest, enslavement, and annihilation known to modern history",[43] while British historian Robin Cross expressed that "In the Second World War no theatre was more gruelling and destructive than the Eastern Front, and nowhere was the fighting more bitter".[44]
The two principal belligerent powers in the Eastern Front were Germany and the Soviet Union, along with their respective allies. Though they never sent ground troops to the Eastern Front, the United States and the United Kingdom both provided substantial material aid to the Soviet Union in the form of the Lend-Lease program, along with naval and air support. The joint German–Finnish operations across the northernmost Finnish–Soviet border and in the Murmansk region are considered part of the Eastern Front. In addition, the Soviet–Finnish Continuation War is generally also considered the northern flank of the Eastern Front.
War breaks out in the Pacific (1941)
The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theater,[45] was the theater of World War II that was fought in eastern Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It was geographically the largest theater of the war, including the Pacific Ocean theater, the South West Pacific theater, the Second Sino-Japanese War, and the Soviet–Japanese War in the last few months of the war.
The Second Sino-Japanese War between the Empire of Japan and the Republic of China had been in progress since 7 July 1937, with hostilities dating back to 1931 with the Japanese invasion of Manchuria.[46] However, it is more widely accepted[c] that the Pacific War itself began on 7 December (8 December Japanese time) 1941, when the Japanese simultaneously attacked American military bases in Hawaii, Wake Island, Guam, and the Philippines, the British colonies of Malaya, Singapore, and Hong Kong, and invaded Thailand.[49][50][51]
The Pacific War saw the Allies pitted against Japan, the latter aided by Thailand and to a lesser extent by the Axis powers, Germany and Italy. The Japanese achieved great success in the initial phase of the campaign, but were gradually driven back using an island hopping strategy. The Allies adopted a Europe first stance, giving first priority to defeating Nazi Germany. The Japanese had great difficulty replacing their losses in ships and aircraft, while American factories and shipyards produced ever increasing numbers of both. Fighting included some of the largest naval battles in history and massive Allied air raids over Japan, as well as the atomic bombings of Hiroshima and Nagasaki.
Japan surrendered unconditionally on 15 August 1945 and was occupied by the Allies. Japan lost its former possessions in Asia and the Pacific and had its sovereignty limited to the four main home islands and other minor islands as determined by the Allies.[52]
Axis advance stalls (1942–43)
Pacific (1942–43)
Eastern Front (1942–43)
Western Europe/Atlantic and Mediterranean (1942–43)
Allies gain momentum (1943–44)
Allies close in (1944)
Axis collapse, Allied victory (1944–45)
The aftermath of World War II saw the rise of two superpowers, the Soviet Union (USSR) and the United States (US). The aftermath of World War II was also defined by the rising threat of nuclear warfare, the creation and implementation of the United Nations as an intergovernmental organization, and the decolonization of Asia, Oceania, South America and Africa by European and East Asian powers, most notably by the United Kingdom, France, and Japan.
Once allies during World War II, the United States and the Soviet Union became competitors on the world stage and engaged in the Cold War, so called because it never resulted in overt, declared total war between the two powers. It was instead characterized by espionage, political subversion and proxy wars. Western Europe and Asia were rebuilt through the American Marshall Plan, whereas Central and Eastern Europe fell under the Soviet sphere of influence and eventually behind an "Iron Curtain". Europe was divided into a US-led Western Bloc and a USSR-led Eastern Bloc. Internationally, alliances with the two blocs gradually shifted, with some nations trying to stay out of the Cold War through the Non-Aligned Movement. The war also saw a nuclear arms race between the two superpowers; part of the reason that the Cold War never became a "hot" war was that the Soviet Union and the United States had nuclear deterrents against each other, leading to a mutually assured destruction standoff.
As a consequence of the war, the Allies created the United Nations, an organization for international cooperation and diplomacy, similar to the League of Nations. Members of the United Nations agreed to outlaw wars of aggression in an attempt to avoid a third world war. The devastated great powers of Western Europe formed the European Coal and Steel Community, which later evolved into the European Economic Community and ultimately into the current European Union. This effort primarily began as an attempt to avoid another war between Germany and France by economic cooperation and integration, and a common market for important natural resources.
The end of the war opened the way for decolonization from the great powers. Independence was granted to India and Pakistan (from the United Kingdom), Indonesia (from the Netherlands), the Philippines (from the US), as well as Israel and a number of Arab nations from specific Mandates which had been granted to great powers by the League of Nations. Independence for the nations of Sub-Saharan Africa came in the 1960s.
The aftermath of World War II saw the rise of communist influence in East Asia, with the People's Republic of China, as the Chinese Communist Party emerged victorious from the Chinese Civil War in 1949.
The historiography of World War II is the study of how historians portray the causes, conduct, and outcomes of World War II.
There are different perspectives on the causes of the war; the three most prominent are the Orthodox from the 1950s, Revisionist from the 1970s, and Post-Revisionism which offers the most contemporary perspective. The orthodox perspective arose during the aftermath of the war. The main historian noted for this perspective is Hugh Trevor-Roper. Orthodox historians argue that Hitler was a master planner who intentionally started World War II due to his strong beliefs on fascism, expansionism, and the supremacy of the German state.[53] Revisionist historians argue that it was an ordinary war by world standards and that Hitler was an opportunist of the sort who commonly appears in world history; he merely took advantage of the opportunities given to him. This viewpoint became popular in the 1970s, especially in the revisionism of A. J. P. Taylor. Orthodox historians argue that, throughout the course of the war, the Axis powers were an evil consuming the world with their powerful message and malignant ideology, while the Allied powers were trying to protect democracy and freedom. Post-revisionist historians of the causes, such as Alan Bullock, argue that the cause of the war was a matter of both the evil and the banal. Essentially Hitler was a strategist with clear aims and objectives, that would not have been achievable without taking advantage of the opportunities given to him.[54] Each perspective of World War II offers a different analysis and provides different perspectives on the blame, conduct and causes of the war.
On the result of the war, historians in countries occupied by the Nazis developed strikingly similar interpretations celebrating a victory against great odds, with national liberation based on national unity. That unity is repeatedly described as the greatest source of future strength. Historians in common glorified the resistance movement (somewhat to the neglect of the invaders who actually overthrew the Nazis). There is great stress on heroes — including celebrities such as Charles de Gaulle, Winston Churchill and Josip Broz Tito — but also countless brave partisans and members of the resistance. Women rarely played a role in the celebrity or the histories, although since the 1990s, social historians have been piecing together the role of women on the home fronts. In recent years much scholarly attention has focused on how popular memories were constructed through selection, and how commemorations are held.
Casualties and war crimes
World War II was the deadliest military conflict in history. An estimated total of 70–85 million people perished, or about 3% of the estimated global population of 2.3 billion in 1940.[55] Deaths directly caused by the war (including military and civilian fatalities) are estimated at 50–56 million, with an additional estimated 19–28 million deaths from war-related disease and famine. Civilian deaths totaled 50–55 million. Military deaths from all causes totaled 21–25 million, including deaths in captivity of about 5 million prisoners of war. More than half of the total number of casualties are accounted for by the dead of the Republic of China and of the Soviet Union. The following tables give a detailed country-by-country count of human losses. Statistics on the number of military wounded are included whenever available.
Recent historical scholarship has shed new light on the topic of Second World War casualties. Research in Russia since the collapse of the Soviet Union has caused a revision of estimates of Soviet World War II fatalities.[56] According to Russian government figures, USSR losses within postwar borders now stand at 26.6 million,[57][58] including 8 to 9 million due to famine and disease.[58][59][56] In August 2009 the Polish Institute of National Remembrance (IPN) researchers estimated Poland's dead at between 5.6 and 5.8 million.[60] Historian Rüdiger Overmans of the Military History Research Office (Germany) published a study in 2000 estimating the German military dead and missing at 5.3 million, including 900,000 men conscripted from outside of Germany's 1937 borders, in Austria, and in east-central Europe.[61][62] The Red Army claimed responsibility for the majority of Wehrmacht casualties during World War II.[63] The People's Republic of China puts its war dead at 20 million,[64] while the Japanese government puts its casualties due to the war at 3.1 million.[65] An estimated 7–10 million people died in the Dutch, British, French and US colonies in South and Southeast Asia, mostly from war-related famine.[66][67][68][69][70]
Genocide, concentration camps, and slave labour
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The Holocaust (/ˈhɑːləkɔːˈst/ , HAW-lə-kawst) was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. The murders were carried out primarily through mass shootings and poison gas in extermination camps, chiefly Auschwitz-Birkenau, Treblinka, Belzec, Sobibor, and Chełmno in occupied Poland. Separate Nazi persecutions killed a similar or larger number of non-Jewish civilians and prisoners of war (POWs); the term Holocaust is sometimes used to refer to the persecution of these other groups.
The Nazis developed their ideology based on racism and pursuit of "living space", and seized power in early 1933. Meant to force all German Jews to emigrate, regardless of means, the regime passed anti-Jewish laws, encouraged harassment, and orchestrated a nationwide pogrom in November 1938. After Germany invaded Poland in September 1939, occupation authorities began to establish ghettos to segregate Jews. Following the June 1941 invasion of the Soviet Union, 1.5 to 2 million Jews were shot by German forces and local collaborators.
Later in 1941 or early 1942, the highest levels of the German government decided to murder all Jews in Europe. Victims were deported by rail to extermination camps where, if they survived the journey, most were killed with poison gas. Other Jews continued to be employed in forced labor camps where many died from starvation, abuse, exhaustion, or being used as test subjects in deadly medical experiments. Although many Jews tried to escape, surviving in hiding was difficult due to factors such as the lack of money to pay helpers and the risk of denunciation. The property, homes, and jobs belonging to murdered Jews were redistributed to the German occupiers and other non-Jews. Although the majority of Holocaust victims died in 1942, the killing continued at a lower rate until the end of the war in May 1945.
Many Jewish survivors emigrated outside of Europe after the war. A few Holocaust perpetrators faced criminal trials. Billions of dollars in reparations have been paid, although falling short of the Jews' losses. The Holocaust has also been commemorated in museums, memorials, and culture. It has become central to Western historical consciousness as a symbol of the ultimate human evil.
Occupation
German-occupied Europe (or Nazi-occupied Europe) refers to the sovereign countries of Europe which were wholly or partly militarily occupied and civil-occupied, including puppet governments, by the military forces and the government of Nazi Germany at various times between 1939 and 1945, during World War II, administered by the Nazi regime under the dictatorship of Adolf Hitler.[71]
The German Wehrmacht occupied European territory:
- as far east as the town of Mozdok in the North Caucasus in the Soviet Union (1942–1943)
- as far north as the settlement of Barentsburg in Svalbard in the Kingdom of Norway
- as far south as the island of Gavdos in the Kingdom of Greece
- as far west as the island of Ushant in the French Republic
In 1941, around 280 million people in Europe, more than half the population, were governed by Germany or their allies and puppet states.[72] It comprised an area of 3,300,000 km2 (1,300,000 sq mi).[73]
Outside of Europe, German forces controlled areas of North Africa, including Egypt, Libya, and Tunisia between 1940 and 1945. German military scientists established the Schatzgraber Weather Station as far north as Alexandra Land in Francis Joseph Land. Manned German weather stations also operated in North America included three in Greenland, Holzauge, Bassgeiger, and Edelweiss. German Kriegsmarine ships also operated in all oceans of the world throughout World War II.
Home fronts and production
Military production during World War II was the production or mobilization of arms, ammunition, personnel and financing by the belligerents of the war, from the occupation of Austria in early 1938 to the surrender and occupation of Japan in late 1945.
The mobilization of funds, people, natural resources and material for the production and supply of military equipment and military forces during World War II was a critical component of the war effort. During the conflict, the Allies outpaced the Axis powers in most production categories. Access to the funding and industrial resources necessary to sustain the war effort was linked to their respective economic and political alliances.
| Country/Alliance | Year | ||||||
|---|---|---|---|---|---|---|---|
| Average 1935-39 | 1940 | 1941 | 1942 | 1943 | 1944 | Total 1939–44 | |
 U.S.A. | 0.3 | 1.5 | 4.5 | 20.0 | 38.0 | 42.0 | 106.3 |
 Britain | 0.5 | 3.5 | 6.5 | 9.0 | 11.0 | 11.0 | 41.5 |
 U.S.S.R. | 1.6 | 5.0 | 8.5 | 11.5 | 14.0 | 16.0 | 56.6 |
| Allies Total | 2.4 | 10.0 | 20.0 | 41.5 | 64.5 | 70.5 | 204.4 |
 Germany | 2.4 | 6.0 | 6.0 | 8.5 | 13.5 | 17.0 | 53.4 |
 Japan | 0.4 | 1.0 | 2.0 | 3.0 | 4.5 | 6.0 | 16.9 |
| Axis Total | 2.8 | 7.0 | 8.0 | 11.5 | 18.0 | 23.0 | 70.3 |
The term "home front" covers the activities of the civilians in a nation at war. World War II was a total war; homeland military production became vital to both the Allied and Axis powers. Life on the home front during World War II was a significant part of the war effort for all participants and had a major impact on the outcome of the war. Governments became involved with new issues such as rationing, manpower allocation, home defense, evacuation in the face of air raids, and response to occupation by an enemy power. The morale and psychology of the people responded to leadership and propaganda. Typically women were mobilized to an unprecedented degree.
All of the powers used lessons from their experiences on the home front during World War I. Their success in mobilizing economic output was a major factor in supporting combat operations. Among morale-boosting activities that also benefited combat efforts, the home front engaged in a variety of scrap drives for materials crucial to the war effort such as metal, rubber, and rags. Such drives helped strengthen civilian morale and support for the war effort. Each country tried to suppress negative or defeatist rumors.
The major powers devoted 50–61 percent of their total GDP to munitions production. The Allies produced about three times as much in munitions as the Axis powers.
Source: Goldsmith data in Harrison (1988) p. 172
Source: Jerome B Cohen, Japan's Economy in War and Reconstruction (1949) p 354
Advances in technology and warfare
Technology played a significant role in World War II. Some of the technologies used during the war were developed during the interwar years of the 1920s and 1930s, much was developed in response to needs and lessons learned during the war, while others were beginning to be developed as the war ended. Many wars have had major effects on the technologies that we use in our daily lives, but World War II had the greatest effect on the technology and devices that are used today. Technology also played a greater role in the conduct of World War II than in any other war in history, and had a critical role in its outcome.
Many types of technology were customized for military use, and major developments occurred across several fields including:
- Weaponry: ships, vehicles, submarines, aircraft, tanks, artillery, small arms; and biological, chemical, and atomic weapons
- Logistical support: vehicles necessary for transporting soldiers and supplies, such as trains, trucks, tanks, ships, and aircraft
- Communications and intelligence: devices used for remote sensing, navigation, communication, cryptography and espionage
- Medicine: surgical innovations, chemical medicines, and techniques
- Rocketry: guided missiles, medium-range ballistic missiles, and automatic aircraft
Military weapons technology experienced rapid advances during World War II, and over six years there was a disorientating rate of change in combat in everything from aircraft to small arms. Indeed, the war began with most armies utilizing technology that had changed little from that of World War I, and in some cases, had remained unchanged since the 19th century. For instance cavalry, trenches, and World War I-era battleships were normal in 1940, but six years later, armies around the world had developed jet aircraft, ballistic missiles, and even atomic weapons in the case of the United States.
World War II was the first war where military operations often targeted the research efforts of the enemy. This included the exfiltration of Niels Bohr from German-occupied Denmark to Britain in 1943; the sabotage of Norwegian heavy water production; and the bombing of Peenemunde. Military operations were also conducted to obtain intelligence on the enemy's technology; for example, the Bruneval Raid for German radar and Operation Most III for the German V-2.
- "For fifty-three long months, beginning in July 1937, China stood alone, single-handedly fighting an undeclared war against Japan. On 9 December 1941, after Japan's surprise attack on Pearl Harbor, what had been for so long a war between two countries now became part of a much wider Pacific conflict."[47][48]
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