The former Soviet Union, it's Eastern Bloc satellites such as Bulgaria, Romania, Hungary, Yugoslavia, Poland, the former East Germany and other Eastern European nations.
Also Cuba, North Korea, North Vietnam, several African nations, and then we have China.
China is still officially communist, although they are currently up to their eyeballs in good ole' capitalism, being the world's largest emerging economy. The government still maintains an iron grip on China's citizens, with a bad civil rights record, and there is still widespread poverty.
..
Capitalism hadn't existed long enough to fail.
Communism ( a classless stateless society) has never existed in Cuba.
Communism (a classless stateless society based on production for use and democratic control) has never existed in China.
SOMETHING!
Communism (a classless stateless society based on production for use) has never existed.
Communism (a classless stateless society based on production for use) has never existed and so cannot be replaced by anything.
While communism informally existed as different ideological systems of radical socialist groups, communism, as we know it now, was proposed by Marx and Engels in their 1848 Communist Manifesto.
What existed in East Germany was state capitalism, not Communism, as there were still classes, money and wages.
Communism (classless stateless society) has never existed.
A state capitalist system with a dictatorial government.
Truman wanted to "contain" communism, that is prevent it from spreading, but leave it be in countries where it already existed. MacArthur wanted to destroy communism by attacking any and all countries where it existed.
Communism is not totalitarian. A Communist world would have no government or classes or money.