NPCA's Timeline: 1900-1920
| August 25, 1916: |
 The National Park Service is created by the Organic Act. |
| May 19, 1919: |
The National Park Association (NPA) is created by the same people who founded the park service. The association is renamed the National Parks and Conservation Association in 1970 and National Parks Conservation Association in 2000. |
| December 1919: |
NPA champions its first major park issue, advocating that the Park Service provide food for the elk that live inside Yellowstone during the winter, to prevent the elk from wandering outside the park in search of food and being killed by hunters. |
| 1920: |
"National Parks Bulletin" is produced, which today is known as "National Parks magazine". |
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