The correctly punctuated version of the sentence is: The Soviet Union, an ally of the United States during World War II, took control of the governments of neighboring countries: China, after a civil war, fell under Communist rule; and the Korean conflict, in which Americans were involved, seemed to prove that Communists wanted to take over as much land as possible.
The correct version of the sentence is:
The Soviet Union, an ally of the United States during World War II, took control of the governments of neighboring countries: China, after a civil war, fell under Communist rule; and the Korean conflict, in which Americans were involved, seemed to prove that Communists wanted to take over as much land as possible.
This version uses colons to introduce the listed items and semicolons to separate the clauses properly, enhancing clarity and readability.
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