Obviously there would have been no Civil War. The Civil War was a defining period in American history and in the development of who we are as a nation. That's something we wouldn't have.
There is an almost cult like following or whatever to The Civil War, it's a big thing to a lot of people, and obviously without The Civil War we wouldn't have all the things about it that we have.
I'm not sure what it would have done to American Government, American society at the time that sort of thing had there been no Civil War.
Had there been no Civil War I think Lincoln would still have been re-elected in 1864, but he would not have been assassinated. I don't know if healthwise he would have survived both terms, but he would probably not have been shot.
I think slavery would have ended certainly by the beginning of the 20th Century. It was already beginning to move in that direction. I think a lot of Southerners, including those who owned slaves, were beginning to question slavery both morally and economically. Even without The Civil War, I don't think slavery would have lasted a lot longer.
I think Civil Rights would have come with much less strife and difficulty, I think it would have come maybe slower, but it would have come easier than in OTL.
I think one of the problems with Civil Rights in the 1960's that made it so difficult and stressful was this. When the Civil Rights movement began in the late 1950's and early 1960's we were less than a century from the end of The Civil War. We were too close to it in time, the feelings about it were still too close, too raw. The Federal Government imposing Civil Rights in the South, it was like The North imposing itself on an already defeated South and over the same issues it had only a century earlier, and I think that's why it was such a raw issue. Had there been no Civil War, that feeling would not have been there in the same way.
Also, we wouldn't have the history, the monuments, the re-enactments, the stuff like that we have from The Civil War.