Different Civil Rights
The Civil Rights Era would not have happened, because he would have made sure the freedmen had equal rights with whites. That is probably what would have happened, and the South might have made more with the KKK to make sure that blacks did not use their freedom. The KKK Act would have still been made, but only it would made by Lincoln instead of Grant. Lincoln may have not been seen as such a great president if he survived. The fact he got assassinated brought him more on the spotlight and people saw all of the great things he did. Although, he might still be as famous.