when was the us national park system established
History of the National Park Service On June 10, 1933, President Franklin D. Roosevelt signed Executive Order 6166 which consolidated all National Parks and National Monuments, National Military Parks, the eleven National Cemeteries, National Memorials, and the National Capital Parks into a single National Park System. The National Park Service was directed to oversee all of these areas.[4] There were three significant results of this action: