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Warren G. Harding became the 29th president of America.
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Acts that established an immigration quota based on immigrants' country of origin.
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At St. Mary's Hospital, London, Alexander Fleming discovered penicillin (antibiotics that greatly reduced the number of deaths from infection.)
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The Great Depression was the worst economic downturn in America. Started by panic after the stock market crash of 1929
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A period of severe dust storms that greatly damaged the ecology and agriculture of the American prairies. The dust Bowl aided the Great Depression.
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Were implemented during the administration of President Franklin D. Roosevelt to combat the effects of the Great Depression on the U.S. economy.
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A surprise, military strike by the Imperial Japanese Navy Air Service upon the U.S. naval base at Pearl Harbor in Honolulu.
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The United States joined World War II after Japan attacked Hawaii