Timeline By 19374 Jul 7, 1776 Independence Sep 17, 1787 Ratification of Constitution Jul 4, 1803 Louisiana Purchase Mar 6, 1820 Missouri Compromise Aug 21, 1831 Nat Turner's slave rebellion Mar 2, 1836 Texas Independence Feb 2, 1848 Treaty of Guadalupe Hidalgo Jan 29, 1850 Compromise of 1850 Jun 3, 1857 Dred Scott Decision Dec 20, 1860 South Carolina Secession Sep 17, 1862 Battle of Antietam May 18, 1863 Batte of Vicksburg Jul 1, 1863 Battle of Gettysburg