four major events occurred that ultimately lead the seven lower Southern States to secede from the Union, history homework help

Between 1857 and 1861, four major events occurred that ultimately lead the seven lower Southern States to secede from the Union. These events were the Dred Scott Decision [60 U.S. 393 (1857)], the Lincoln-Douglas debates, John Brown’s raid on Harper’s Ferry, and Lincoln’s election in 1860. Pick two events and briefly describe each event, explain why they were both important to Southern secession, and which one of the two do you believe was the most important.

it must be type written on only one side of the page, double-spaced, and all margins set to one (1) inch. and MLA