1800-1876 By ccampbell 1801 Jefferson Elected 1803 Louisiana Purchase 1804 Louisiana Purchase 1809 James Madison Elected 1812 War of 1812 1819 United State Annexes East Florida 1820 Missouri Compromise 1823 Monroe Doctrine United States opposes European colonization 1848 Fugitive Slave Act 1854 Kansas-Nebraska Act 1860 Abraham Lincoln Elected President 1862 Battle of Antietam 1863 Battle of Gettysburg 1865 Civil War ends