When the thirteenth amendment abolished involuntary servitude, it became illegal to

The Thirteenth Amendment was the first of a series of Amendment that aimed at recognizing the basic liberties of all race -especially of black people- during the Reconstruction Era. This Amendment prohibited slavery or any other system of involuntary servitude, a system that had been so common in the United States so far; thus, it became illegal to regard anyone as a slave and to force one person to work for another person against their will.

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explanation:

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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