Popular Sovereignty, Wilmot Proviso, Election of 1848, Free-Soil Party, Underground Railroad, Harriet Tubman, Personal Liberty Laws, Compromise of 1850, Fugitive Slave Law, Uncle Tom’s Cabin, Gadsden Purchase, Stephen Douglas, Kansas-Nebraska Act,  “Bleeding Kansas,” Lawrence, Charles Sumner, Preston Brooks, Pottawatomie Massacre, John Brown, Lecompton Constitution, Election of 1856, James Buchanan, John C. Fremont, “Fire-Eaters,” Dred Scott Decision, Roger Taney, Panic of 1857, Lincoln-Douglas Debates, Freeport Doctrine, Harpers Ferry, Election of 1860, Constitutional Union Party, Republican Party, Abraham Lincoln, Confederate States of America, Jefferson Davis, Crittenden Amendments, Lincoln’s First Inaugural Address