What are some other ways colonists could have accomplished their goals without the use of slaves

They could have used spare time to invent and create a new system or procedure. By doing this they could have maybe come up with a different type of system that would benefit everyone including the Africans.

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explanation:

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the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.