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Date |
Event(s) |
| 1 | 1910 | - 1910: United States population — 91,972,266.
- 21 Apr 1910: Mark Twain [Samuel Langhorne Clemens] dies in Redding, Fairfield County, Connecticut at age 74.
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| 2 | 1912 | - 6 Jan 1912: New Mexico becomes the 47th state.
- 14 Feb 1912: Arizona becomes the 48th state.
- 15 Apr 1912: The Titantic sinks in the Atlantic Ocean.
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| 3 | 1913 | - 1913: Henry Ford begins using standardized interchangeable parts and assembly line techniques in his automobile plant. His expanded use of this process revolutionizes American industry.
- 1913—1914: A depression lasts 20 months and into 1914.
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| 4 | 1914 | - 15 Aug 1914: The Panama Canal opens.
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| 5 | 1917 | - 6 Apr 1917: The United States enters World War I.
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| 6 | 1918 | - 31 Mar 1918: The United States adopts Daylight Savings Time.
- 11 Nov 1918: World War I hostilities end.
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| 7 | 1919 | - 11 Dec 1919: James County, Tennessee is absorbed into Hamilton County, Tennessee. James County had dissolved in bankruptcy on April 15, 1919.
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| 8 | 1920 | - 1920—1921: A depression lasts for 18 months and into 1921.
- 1920: United States population — 105,710,620.
- 18 Aug 1920: The Nineteenth Amendment to the United States Constitution is adopted, granting women the right to vote.
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| 9 | 1923 | - 15 Sep 1923: Oklahoma is placed under martial law due to terrorist activities of the Ku Klux Klan.
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| 10 | 1925 | - 10 Jul 1925—21 Jul 1925: The Scopes "Monkey Trial" is held in Dayton, Rhea County, Tennessee.
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| 11 | 1926 | - 2 Jul 1926: Congress creates the Army Air Corps.
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| 12 | 1927 | - 20 May 1927: Charles Lindbergh completes the first transatlantic flight and lands The Spirit of St. Louis in Paris, France at age 25. His flight lasts 33½ hours.
- 6 Oct 1927: The Jazz Singer, the first commercial motion picture with partial sound, is released.
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| 13 | 1929 | - 29 Oct 1929—1933: The stock market crashes. The Great Depression lasts for 42 months and into 1933.
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| 14 | 1930 | - 1930: United States population — 122,775,046.
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| 15 | 1931 | - 1 Sep 1931: The Bank Panic begins.
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| 16 | 1933 | - 4 Mar 1933: Franklin Delano Roosevelt is inaugurated as President of the United States at age 51.
- 12 Mar 1933: President Franklin Delano Roosevelt broadcasts his first radio "fireside chat."
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| 17 | 1935 | - 14 Aug 1935: The Social Security Act is signed into law.
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| 18 | 1937 | - 1937—1938: A depression lasts for 10 months and into 1938.
- 6 May 1937: The Hindenburg dirigible bursts into flames while landing at Lakehurst, Ocean County, New Jersey.
- 2 Jul 1937: Amelia Earhart disappears in a flight over the Pacific Ocean at almost age 40.
- 21 Sep 1937: J.R.R. Tolkien publishes The Hobbit, the prelude to his Lord of the Rings trilogy.
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| 19 | 1938 | - 30 Oct 1938: Orson Welles creates a national panic with his Invasion from Mars radio broadcast at age 23.
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| 20 | 1940 | - 1940: United States population — 131,669,275.
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| 21 | 1941 | - 24 Nov 1941: The United States Supreme Court invalidates the California "Anti-Okie" statute that made it a misdemeanor to bring an indigent non-resident into California. [The statute was primarily targeted against Dust Bowl migrants.]
- 7 Dec 1941: The Japanese bomb Pearl Harbor, Hawaii, drawing the United States into World War II.
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| 22 | 1944 | - 6 Jun 1944: The Allies launch the Normandy Invasion in France to begin the end of World War II.
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| 23 | 1945 | - 12 Apr 1945: President Franklin Delano Roosevelt dies in Warm Springs, Meriwether County, Georgia at age 63.
- 8 May 1945: VE Day is proclaimed.
- 6 Aug 1945: An atom bomb is dropped on Hiroshima, Japan.
- 9 Aug 1945: An atom bomb is dropped on Nagasaki, Japan.
- 2 Sep 1945: VJ Day is proclaimed as the Japanese formally surrender to General Douglas MacArthur on board The Missouri.
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| 24 | 1950 | - 1950: United States population — 150,697,361.
- 1 Jul 1950: United States military forces land in Korea.
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| 25 | 1951 | - 19 Apr 1951: General Douglas MacArthur gives his Old Soldiers Never Die speech to Congress at age 71.
- 21 Jun 1951: CBS makes the first color telecast.
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| 26 | 1953 | - 25 Jul 1953: Armistice is signed in Korea.
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| 27 | 1956 | - 25 Sep 1956: The first transatlantic telephone cable begins operation.
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| 28 | 1957 | - 4 Oct 1957: Russia launches Sputnik 1 into outer space.
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| 29 | 1960 | - 1960: United States population — 179,323,175.
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