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In 1901 Theodore Roosevelt became president.
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In 1903 Henry Ford founded the Ford Motor Company.
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in 1905 Albert Einstein announces his special theory of relativity and other key theories in physics.
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in 1907 a coal mine in Monongha, WV had an explosion that killed 361 people. Then two weeks later, a coal mine explosion in Jacobs Creek PA left 239 dead.
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The National Association for the Advancement for Colored People, also known as the NAACP, was founded in New York in 1909.
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In 1911 Calbraith Rodgers is the first pilot to wing solo across North America in 49 days.
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In 1913 the Ludlow Massacre occurred, when the Colorado militia fired on striking coal miners, killing 21 people, including 11 children and 3 women.
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In 1917 the United States entered WWI and sends the first troops to France.
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In 1918 A world wide influenza epidemic strikes and by the end of it in 1920 over 20 million people were dead.
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In 1919 the 18th Amendment adopted Prohibition. In 1920 the 19th Amendment ratified Women's suffrage. Warren G. Harding was elected President, and the US population reached 106 million.
