Correlation is not causation. One could just as easily argue that it was the intervention of western powers (France and the US) in Southeast Asia that gave the

Correlation is not causation. One could just as easily argue that it was the intervention of western powers (France and the US) in Southeast Asia that gave the communists legitimacy which then lead to the holocaust in Cambodia. Liberalization in Vietnam had more to do with changes in China and improved relations with the United States, than the Berlin Wall.