Ineed only number 68 : ) i will mark you as the brainless if you me with this. : )

The Confederacy? The interest seems to be the act of slavery and the war Lincoln is talking about must be the Civil War, which was taking place while Lincoln was addressing his second inaugural. Lincoln was reasoning that the Confederacy was fighting to keep slavery, which is the interest the "insurgents" have. Lincoln also did not want slavery to continue to spread, but he was fine with having slavery, "restrict the territorial enlargement if [slavery]".

a rebel or revolutionary basically meaning that the country or state they are living in is gonna be attacked by their enemies