Reconstruction would have probably gone a lot more smoothly and easily. Lincoln wanted the nation to come back together again "with malice toward none," so there probably would not have been the effort to punish the South for the Civil War as there was in OTL.
The effort during reconstruction to punish the South and make it pay for the war caused a lot of tension and bad feelings between Northerners and Southerners, and probably made things more difficult for Black people in the South. Those tensions would probably have been reduced had Lincoln lived and enacted a policy of reconstruction with malice toward none.
I'm wondering, if Lincoln had lived and put in place a reconstruction that really was "with malice toward none," and avoided some of that tension, how would that have effected conditions in the South for Black people during and after reconstruction? Would it have made things easier for them? Would it have effected Civil Rights later on? Would the Civil Rights movement in TTL have had easier going than in OTL? I've often wondered about that.