Also, remind me who attacked Fort Sumter?

You should look up what happened to precipitate the attack of Fort Sumter. Occupying a previously unoccupied fort and sending a massive military convoy to reinforce it isn't exactly a peaceful overture.

He may have ended slavery (and he didn't even really want to do that),

Neo-Confederate BS.

Dude, the war was 150 years ago. You don't need to keep fighting it. We're allowed to state uncomfortable truths about our side. Or maybe you're unaware:

In August 1862, Lincoln stated: "If I could save the union without freeing any slaves I would do it; and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone I would also do that." In fact, by that time, immense pressure was building to end slavery and Lincoln had privately concluded that he could save the Union only by issuing an emancipation proclamation, which he had already drafted.

Also, remind me who attacked Fort Sumter?

You should look up what happened to precipitate the attack of Fort Sumter. Occupying a previously unoccupied fort and sending a massive military convoy to reinforce it isn't exactly a peaceful overture.