Imagine you are stranded on an island. It has no previous government and you have been chosen by your peers to
serve as the first "President of the island. Where would you
start? What priorities would you have? Which procedures for
the new government would you set up? How would you pay
for the island's debts? George Washington, our first
President, had to face all of these issues?

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.

hope this .

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explanation:

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.