1840–1856, Second PartySystem: Democrats and Whigs; 3. 1860–1896, Third PartySystem: Republicans and Democrats; 4. 1896–1932, FourthPartySystem: Republicans
Article 160 Electoral system (页面存档备份,存于互联网档案馆) IPU Electoral system (页面存档备份,存于互联网档案馆) Inter-Parliamentary Union [2] (页面存档备份,存于互联网档案馆) Fourth amendment to the