File:United States 1837-03-1838.pngDescriptionUnited States 1837-03-1838.png Map of the states and territories of the United States as it was from March 1837 to 1838. On March 28 1837, the Platte
File:United States 1837-01-1837-03.pngDescriptionUnited States 1837-01-1837-03.png Map of the states and territories of the United States as it was from January 1837 to March 1837. On January
File:United States 1838-1842.pngDescriptionUnited States 1838-1842.png Map of the states and territories of the United States as it was from 1838 to 1842. On July 4 1838, Iowa Territory
File:United States 1849-1850.pngCommons Attribution 2.5 truetrue You may select the license of your choice. English Map of the states and territories of the United States from 1849-1850