Independence By nj19359 Jul 4, 1776 Independence September 17, 1787 Sep 17, 1787 Ratification Apr 30, 1803 LA purchase April 30, 1803 Feb 14, 1820 MO compromise Aug 21, 1831 Nat Turner Rebellion Mar 2, 1836 TX independence March 2, 1836. Jan 2, 1848 Treaty of Guadalupe Hidalgo Jan 29, 1850 compromise of 1850 Mar 6, 1857 Dred Scott Decision Dec 20, 1860 South Carolina Secession December 20, 1860 Sep 17, 1862 Antietam Battle September 17, 1862 May 18, 1863 Vicksburg battle May 18-July 4, 1863. Jul 1, 1863 Gettysburg battle