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  required nonlaborers to get certification form the Chinese Government to immigrate.
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  The Chinese Exlusion act expired and congress extended it to the Geary Act and added more restrictions. and ended in the 1920s
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  The Great Migration was the mass movement of about five million southern blacks to the north and west.
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  white rioters ramoaged through african american neighborhods, leaving 39 dead.
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  First movement of blacks occured during World War I when 454,000 black southerners moved north
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  This made it so that there was a yearly limit of 105 chinese immigrats.The so-called national origin system, with various modifications, lasted until Congress passed the Immigration Act of 1965