A few speculations:
There would have been no iron curtain, Europe would be be part of the communist block. (Although that would probably be failing by now, especially in England.)
Millions of immigrants would probably have stayed put. Much of the Americas would have been under tremendous communist pressure as well as the rest of the world.
Without the arms race and competition between the U.S. and Soviet Union there probably wouldn't have been much of a space program anywhere yet.
Wouldn't have been any rock 'n' roll music and jazz, or at least the kind influenced by African Americans.
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