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1910
| The Mexican Revolution brings an influx of immigrants to the U.S. seeking safety and employment.
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1916
| Rep. Jeannette Ranking (R-Mont.) becomes the first woman elected to Congress.
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1917
| During WWI, many women enter into jobs working in industries such as mining, chemical manufacturing, auto and railway plants, streetcar conducting and mail delivery.
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1920
| The 19th Amendment gives women the right to vote and is ratified by the required 36 states. When African American women try to register to vote in most Southern states they face property tax requirements, literacy tests and other obstacles. A small number of fire departments begin hiring black males.
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1921
| Emergency Immigration Restriction Law introduces a quota system that favors northern and western Europeans.
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1924
| Congress passes the Indian Citizenship Act, granting U.S. citizenship to Native Americans. Several nations, including the Hopi and the Iroquois, decline citizenship in favor of retaining sovereign nationhood.
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1941
| President Roosevelt issues an executive order banning discrimination against minorities in defense contracts.
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1942
| Following the bombing at Pearl Harbor, U.S. government interns over 110,000 Japanese Americans in "relocation camps" encircled by barbed wire.
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1947
| Jackie Robinson becomes the first African American to play major league baseball.
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1948
| The Women's Armed Services Integration Act grants women permanent status in the Army, Navy, Marine Corps and Air Force.
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