At one point, Lincoln delivers a soliloquy about how he assumed certain kinds of unprecedented powers, which neither he nor anyone else knew whether he actually had, to help prosecute the war. He specifically mentions suspending Habeas Corpus and the declaration of the Emancipation Proclamation as being among these powers. Given what he says, why did he need to pass the 13th amendment to end slavery forever?

A.He believed that his Republican congress wouldn't pass the 13th amendment.
B.He knew that if he didn't, the southerners would claim that the emancipation proclamation was illegal and force slaves back into slavery.
C.He knew he was going to be killed and wanted to prepare for Andrew Johnson.
D.None of the above