Through trade ancient civilizations gained wealth power and territory and shared

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Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.

These islands/chinampas then provided rich soil for crops with easy access to water. i hope this is correct, im so sorry if its not !