What are three events that occurred between 1857 and 1859 that facilitated southern secession?

a) complete splintering of the republican party in 1858
b) the abraham lincoln-stephen douglas debates
c) rejection of the lecompton constitution by buchanan
d) lincoln's election as president of the united states
e) the dred scott decision by the supreme court
f) raid on harper's ferry by abolitionist john brown

B) the Abraham Lincoln-Stephen Douglas debates

E) the Dred Scott decision by the Supreme Court

F) raid on Harper's Ferry by abolitionist John Brown

Explanation:

B) The seven discussions among Douglas and Lincoln during the Illinois state decision crusade (1858) included crucial dialogs to the sectional clash about bondage and states' rights.  

E) Dred Scott v. John F.A. Sandford (1857) was a legitimate case wherein the Supreme Court requested that Dred Scott, a slave who had lived in a state where servitude was illegal, reserved no privilege to opportunity; that African Americans would never progress toward becoming natives; and that the Missouri Compromise (1820) was unlawful. This decision exacerbated the sectional debate, in a way to common war.  

F) John Brown's attack on Harpers Ferry (1859) was an endeavor by abolitionist John Brown to begin a slave revolt that was vanquished by the  U.S. Marines, driven by First Lieutenant Israel Greene.