Which effect of the civil rights movement had the greatest impact on the largest number of Americans? A) the integration of Little Rock Central High School

B) the Supreme Court decision in Brown vs. the Board of Education

C) the passage of the Civil Rights Act of 1964

D) the decision to have Marian Anderson perform at the Lincoln Memorial

the passage of the Civil Rights Act of 1964

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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because it took place after the war of 1812 had come to an end.