Unit 8 By Alexa_Espinal Dec 12, 1807 Britain abolishes slave trade Dec 12, 1808 Congress outlaws slave trade Dec 12, 1820 Missouri Compromise Dec 12, 1840 Antis lavers Liberty party organized Dec 12, 1842 Webster-Ashurton treaty Dec 12, 1848 Free Soil Party organized Dec 1, 1850 Fugitive Slave Law Dec 12, 1850 Compromise of 1850 Dec 12, 1852 Pierre defeats Scott for presidency Dec 12, 1854 Republican Party organized