Which group of historical events had the most to do with abolition?
a The Fugitive Slave Act, the Dred Scott decision, and the Kansas-Nebraska Act
b The Compromise of 1850, the Mexican-American War, and the Gadsden Purchase
c The annexation of California, the Anthony Burns case, and the Harper's Ferry revolt
d The Louisiana Purchase, the Missouri Compromise of 1820, and the annexation of Texas

Question

Which group of historical events had the most to do with abolition?
a The Fugitive Slave Act, the Dred Scott decision, and the Kansas-Nebraska Act
b  The Compromise of 1850, the Mexican-American War, and the Gadsden Purchase 
c The annexation of California, the Anthony Burns case, and the Harper's Ferry revolt
d The Louisiana Purchase, the Missouri Compromise of 1820, and the annexation of Texas