After World War I, widespread fear of communism A. was systematically played down by the newspapers.

B. resulted in the Scopes Trial.

C. strengthened the public's poor opinion of labor unions.

D. diminished predictions of a worldwide revolution.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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