The emancipation proclamation was issued under the war power of the president. In war, there are few things the president can’t do, but that only applies to where we are at war. Lincoln held (correctly, as far as I know) that the federal government did not the authority to alter the institution of slavery within an extant state. The federal government did have authority over the territories, and over the admission of new states. If Lincoln had anything to say about it, there would be no slavery in the territories, and there would be no new slave states. He advocated the abolition of slavery everywhere, but only tried to abolish it where he had some authority to do so.
He did push for a constitutional amendment to abolish slavery everywhere, but he didn’t try to do that on the authority of the president.
lincoln did have a say in it with the Emancipation Proclamation and it only freed the slaves of the states in rebellion, correct?