According to Lincoln, what was the cause of the Civil War? What was the fundamental disagreement between the “insurgents” and the “Government”?

Lincoln reiterates the cause of the war, slavery, in saying that "slaves constituted a peculiar and powerful interest. All knew that this interest was somehow the cause of the war." The words "wringing their bread from the sweat of other men's faces" are an allusion to the Fall of Man in the Book of Genesis.

Explanation:

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.