At the beginning of the biography, the author writes that President Adams was a better political thinker than a president. is this claim supported by the article? which lines from the biography support your thinking?

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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the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

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