Significant Events in US, World and Texas 1800 - 1900 By miryam10 1801 Thomas Jefferson becomes the 3rd president of U.S. 1803 Louisiana Purchase 1805 Lewis and Clark's expedition reaches the Pacific Ocean 1812 War of 1812 1819 U.S. acquires Florida under the Adams - Onis Treaty 1830 Congress passes Indian Removal Act 1831 Trail of Tears started Feb 23, 1836 Battle of the Alamo 1845 The United States annexes Texas 1846 Mexican - American war begins 1849 California Gold rush begins 1860 Abraham Lincoln is elected president 1861 Civil War begins 1865 President Lincoln is assassinated 1865 Civil war ends 1867 U.S. purchases Alaska from Russia 1881 President Garfield is assassinated 1898 USS Maine explodes 1899 Philippine - American War begins
