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Congress made the Chinese Exclusion Act which imposed a 10 year ban on the immigration of Chinese laborers. The original length of the ban was set to 20, but it conflicted with U.S.-China treaty commitments that permitted the free movement of people.
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Congress broadened the Chinese Exclusion Act to apply to all persons of chinese descent, "whether subject of China or any other foreign power." The amendments also required stricter documentation for chinese travellers.
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Throughout the 1920s, around 800,000 African Americans moved north to escape slavery and make a better life for themselves.
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More black immigration to northern states.
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(1940-1960) Millions of blacks immigrated towards northern and western cities. The pacific northwest's black population grew substantially as well, around 300-400% in areas.
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Congress repealed all laws relating to the exclusion and deportation of the chinese. Congress permitted 105 Chinese to immigrate to the U.S. each year, and allowed them to be American citizens.