An amendment to the constitution must be ratified by
a. three-quarters of the states
b. two-thirds of the states
c, a two-thirds vote of congress
d. a three-quarters vote of congress

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

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