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In 1921 Warren G Harding was elected as the president of the United States.
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In 1923 Calvin Coolidge was elected as the 30th president of the United States.
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In 1925 science teacher John Scopes was prosecuted for teaching evolution in a Tennessee public school, which a recent bill had made illegal.
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A Scottish biologist Alexander Fleming discovers penicillin in 1928.
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The New Deal was a series of programs and regulations implemented by President Franklin D. Roosevelt from 1933-1939.
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In 1939 Frankin D Roosevelt was inaugurated into office as president of the United States.
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In 1940 Peter Goldmark invented a modern color television system.
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In 1941 Karl Pabst invented the first jeep.
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On December 7, 1941, the Imperial Japanese Navy Air Service struck an attack upon the United States against the naval base at Pearl Harbor in Hawaii killing many.