Maybe, but in my opinion would there still be a Civil Rights movement if 50% of the blacks living in the Confederacy had been killed off in the death camps, and then a large percentage of those survivors ended up fleeing North America for other parts of the world? Maybe, maybe not. I think that the US government would probably vote to give the surviving blacks some sort of monthly cash reparations, and during the years following the end of the war, racially discriminating against blacks would be an extremely illegal and a very taboo thing to do.
Also, would there still be a 1967 Summer of Love occurring in San Francisco's Haight-Ashbury district in the 191 universe? Perhaps many voting aged adults living in the 191 version of the United States would tend to be much more conservative after experiencing the horrors of the Second Great War first hand on North American soil, and leftist ideals such as disarmament, negotiations, and a universal brotherhood of man simply don't ring true for them?
I could imagine something like the Haight-Ashbury hippie scene happening in a place like New Orleans, Louisiana, and maybe a progressive pacifist movement might take root amongst many college aged young adults living across the New South. Instead of San Francisco and Berkeley leading the free-speech movement of the 1960s, it might be the streets of Louisiana and the University of Louisiana where anti-war protests would take place....?
I was imagining a scene in which a bunch of quasi-hippies are holding a protest against US military involvement occurring in Northeast Asia and Alaska. Suddenly the mob of students becomes a little to radical, and a little too violent, and riot control troops move in with bayonets and ruthlessly butcher hundreds of protesters. In OTL the death of four college students at Kent State in 1970 turned into a huge scandal, but in the 191 universe few people are bothered by the deaths of 300 - 400 student protesters. A very different place, but I imagine that some version of the Beatles will still manage to make it to the US and achieve stardom.
For me, it seems like there were still a lot of stories left to be told in this universe, and its too bad that Turtledove didn't continue it.
WW2 didn't have the effect of conservatism on the European youth. The Post-War youth were, if anything, even more leftist. 1968 in France, the Radical Chic left wing radicals, the Post-War movements in Germany of youth that had come of age calling out the previous generation (still in power) as a gaggle of closet Nazis, the impact of the miniseries "Holocaust" in West Germany, and so on.