posted by martha .
Describe the Great Migration.
You'll need to choose WHICH Great Migration you're referring to.
There were several great migrations. Since this is not my area of expertise, I searched Google under the key words "great migration" to get these possible sources:
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You can find the information you desire more quickly, if you use appropriate key words to do your own search. There are many more sources out there.
I hope this helps. Thanks for asking.