In the 1920s, more than 750,000 African Americans left the South--a greater movement of people than had occurred in the Irish potato famine of the 1840s. The large-scale relocation to the Northeast and West brought many other changes with it, as many largely rural people moved into cities for the first time.
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Answer:
The Caste System is a class structure that is determined when you are born. If you are born into a poor family, then you too are poor.
Modern people are Homo sapiens.