In 1933, it was decided that the National Park Service should oversee multiple types of federally protected land. This reorganization transferred land from the war department and the forest service over to the NPS, including national monuments, historic sites, battlefields, lakeshores and recreation areas.
NPS started with a single public unit in 1872, and now oversees more than 400 units (a unit being any type of land previously listed). Fifty-nine of these units are actual national parks.