can communism survive in a single country was always a big question.
I think the original idea was to try a world revolution but that didn't work out.
Us is the main holdout. Russia is basically socialist, EU is basically socialist. China is communist.
Us is the only serious holdout
China is a cocktail of socialism, capitalism, nationalism... claiming it's only one ~ism is probably oversimplifying, but communism is probably a bit far stretch.
Seeing some of the zingers in the comments here, now seems like a great time to plug my "Read Theory, Darn it!" introductory Marxist-Leninist reading list. Read up, comrades!