What role did the evolution of the cold war play in the division of these nations - korea, germany, vietnam? in what country was the division a success? in what country was division a failure?

In all three cases, the Cold War implied divisions of these countries between a communist section and a capitalist section, controlled in turn by the Soviet Union and the United States, respectively.

The only case in which the division did not lead to a war was the division of Germany, although it brought negative consequences for its population.

In the cases of Vietnam and Korea, the divisions generated wars between both models, whose consequences continue to be observed to this day.

your answer would be just capitalism.

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