Who were promised numerous times by the u. s. government that if they signed a new treaty and moved west once more, they'd be left alone?

These were the Southern Indians. Many including the Cherokee and Shawnee were either threatened or forced off the land.  This event is known as the Indian Removal Act. This led to the Trail of Tears.

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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it was douglas macarthur..