|   | 
			 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)
 
  | 
| 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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