Pre-Civil War By jrod Aug 8, 1846 Wilmot Proviso Period: Aug 8, 1846 to Dec 20, 1860 Pre-Civil War Feb 2, 1848 Treaty of Guadalupe Hidalgo Sep 20, 1850 Compromise of 1850 May 30, 1854 Kansas-Nebraska Act May 24, 1856 Pottawatamie Massacre Nov 2, 1858 Lincoln-Douglas Elections Oct 16, 1859 Harper's Ferry Nov 6, 1860 Lincoln elected President Dec 20, 1860 South Carolina Secedes from the Union