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The great migration was when thousands to millions of African Americans moved to the north for oppurtunity and saftey with the help of railroads
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to temporarily limit the numbers of immigrants that could come to the United States by having quotas based on country of birth.
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This identified who could enter as a "non-quota" immigrant; this included wives and unmarried children of US citizens, religious or academic professionals, and “bona-fide students” under 15 years of age.