E.g ended slavery with emancipation proclamation,
ended war by...

.. etc
My bad.. I should have made it a bit clearer
I know he didn't end slavery with the proclamation.. I meant to show a factor that added to the end of slavery, not what actually ended it
Also.. I need three things he did for America.. We have to do an essay tomorrow but I need 3 things to say he did for America, but I can only think of ending slavery.. and for helping to end the war, I'm a bit unsure of what he did to actually do it.. And for the third thing, NO idea