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National Historical Park and National Historic Site are designations in the United States for protected areas of national historic significance, usually managed by the National Park Service. Some federally designated sites are privately owned, but are authorized to request assistance from the National Park Service as affiliated areas. A National Historic Site usually contains a single historical feature that was directly associated with its subject. Derived from the Historic Sites Act of 1935, a number of Historic Sites were established by United States Secretaries of the Interior, but most have been authorized by acts of Congress. A National Historical Park generally extends beyond single properties or buildings. International Historic Site is a unique designation given to Saint Croix Island, Maine on the Canadian border. The National Park Service does not distinguish among these designations in terms of their preservation or management policies. As of October 15, 1966, all historic areas, including National Historical Parks and Historic Sites, in the National Park System are automatically listed on the National Register of Historic Places. There are 41 National Historical Parks measuring 119,049 acres (481.7 km²). There are 77 National Histotic Sites measuring 21,677 acres (87.7 km²).•
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