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This timeline will help frame discussion on the life course principle of historical time and place. Consider how each event might impact human development.
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1914-1918
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Demand for women's suffrage in the United States began in the 1840's and led to the 19th amendment in 1920 that eliminated sex from voting eligibility.
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1929-late 1930's
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1939-1945
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1954-1968
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1960's-1970's