What happened to the communist nations?

In Europe after World War II and until approximately 1990, the following group of communist countries provided a buffer between West Germany and the Soviet Union: Albania, Czechoslovakia, East Germany, Poland, Hungary, Romania, and Bulgaria. They formed the Warsaw Pact in response to NATO and were heavily influenced and financed by the Soviet Union. Albania was expelled from the Pact in 1962 but remained a communist country under the Chinese sphere of influence.
After the Soviet Union collapsed in 1990, these countries, which had had communism imposed on them, became democratic republics, embraced capitalism, and joined NATO. East Germany reunified with West Germany, while Czechoslovakia split into the Czech Republic and Slovakia. Yugoslavia broke up into a number of smaller nations.
Vietnam remains a classic one-party Communist country, while North Korea is nominally communist, and Cuba sticks with communism. The People's Republic of China has moderated some of it most rigid communism but is still a classic one-party state in which the Party owns more than 95 percent of the country's land and controls its economy.