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			 Date | 
			 Event(s) | 
		
	
| 1  | 1901  | - 14 Sep 1901—4 Mar 1909: T Roosevelt/Fairbanks admin
 
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| 2  | 1909  | - 4 Mar 1909—4 Mar 1913: Taft/Sherman and (vacant) admin
 
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| 3  | 1913  | - 4 Mar 1913—4 Mar 1921: Wilson/Marshall admin
 
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| 4  | 1917  | - 6 Apr 1917—28 Jun 1919: World War I (U.S.involvement)
 
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| 5  | 1918  | - 1918—1918: Spanish Influenza (more people hospitalized in WWI from influenza than wounds. US Army training camps became death camps with 80% death rate in some camps)
 
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| 6  | 1920  |  | 
| 7  | 1921  | - 4 Mar 1921—2 Aug 1923: Hardin/Coolidge admin
 
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| 8  | 1923  | - 2 Aug 1923—4 Mar 1929: Coolidge/(vacant) and Dawes admin
 
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| 9  | 1929  | - 4 Mar 1929—4 Mar 1933: Hoover/Curtis admin
 
- 29 Oct 1929—1934: Great Depression
 
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| 10  | 1933  | - 4 Mar 1933—12 Apr 1945: FD Roosevelt/Garner, Wallace and Truman admin
 
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| 11  | 1941  | - 8 Dec 1941—2 Sep 1945: World War II, from U.S. declares war on Japan to Japan's surrender.
 
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| 12  | 1945  | - 12 Apr 1945—20 Jan 1953: Truman/(vacant) and Barkley admin
 
- 6 Aug 1945—9 Aug 1945: 6th: U.S. drops atomic bomb on Hiroshima
9th: U.S. drops atomic bomb on Nagasaki
 
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| 13  | 1950  | - 25 Jun 1950—27 Jul 1953: Korean War
 
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| 14  | 1953  | - 20 Jan 1953—20 Jan 1961: Eisenhower/Nixon admin
 
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| 15  | 1961  | - 20 Jan 1961—22 Nov 1963: Kennedy/Johnson admin
 
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| 16  | 1963  | - 22 Nov 1963—20 Jan 1969: Johnson/(vacant)Humphrey admin
 
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| 17  | 1964  | - 7 Aug 1964—29 Mar 1973: Vietnam War
 
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| 18  | 1969  | - 20 Jan 1969—9 Aug 1974: Nixon/(vacant) and Ford admin
 
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| 19  | 1974  | - 9 Aug 1974—20 Jan 1977: Ford/(vacant)and Rockerfeller admin
 
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| 20  | 1981  | - 20 Jan 1981—20 Jan 1989: Reagan/GHW Bush admin
 
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| 21  | 1989  | - 20 Jan 1989—20 Jan 1993: GHW Bush/Quayle admin
 
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