Why does Communism never work? If it has worked, what are some instances of successful communist nations?

your definition of Communism is wrong: Communism " -colloquialism . In America the term " communist " is used to describe Marxist Leninist socialist nations like the USSR , China , and Cuba . As indicated by the definition above , these nations did not meet the definition of true communism as they still used money and still had a state . Colloquialisms are words that are everyday meanings used by people but which are not accurate .

Communism is a moneyless, classless, stateless society which is the last stage of human society after the transition from socialism to communism

And if you say Communism (i.e socialism)never work

The Soviet union turned an backward feudal country to sending the first man,woman and animal to space

And china was an semi feudal country that was a playground for imperialists and Comrade chairman mao changed china and made the first steps to overtaking the united states of America as the world superpower.