During the post-war period, the USSR was able to control Poland and Hungary by means of installing puppet governments and keeping Soviet troops stationed in those countries among other means.
The farmers in Massachusetts rebelled during Shay's rebellion because of recently placed high taxes.
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Answer:
The corollary stated that not only were the nations of the Western Hemisphere not open to colonization by European powers, but that the United States had the responsibility to preserve order and protect life and property in those countries.