Answer: . As the Athenian empire expanded and trade grew, Greek knowledge spread.
There was discontent [dissatisfaction] in Russia because the government was corrupt and ineffective, there was widespread poverty in the country, there was a scarcity of food, and the Russians suffered massive losses in World War I.
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Similarities: the north Koreans and the Vietcong were communist, the Russians back both the north and south. Both are examples of the US following it's containment policy.
difference: Vietnam was dense jungle warfare.