Timeline 1845-1860 By Smalls1235 May 9, 1846 The start of the Mexican War the start of the Mexican War Period: May 9, 1846 to Dec 18, 2013 End of the mexican war Aug 8, 1846 The wilmot Proviso Jan 29, 1850 The compromise of 1850 Mar 20, 1852 Uncle Tom's Cabin Book Published May 30, 1854 Congress Pass Kansas-Nebraska Act May 21, 1856 Proslavery attack on Lawrence Kansas