Liberty Island and Ellis Island have been the property of the United States government since 1800[1] and 1808, respectively.[29] Historical circumstances have led to the unusual situation of Liberty Island and 3.3 acres (13,000 m2) of Ellis Island being exclaves of New York, both completely surrounded by New Jersey. The dominion, jurisdiction, and sovereignty of the islands have variously been the subject of a colonial land grant,[30] a provincial governor's directive,[31] and an interstate compact,[32] as well as several court cases and a U.S. Supreme Court decision. Liberty Island and the acreage on Ellis Island are part of New York City which are completely surrounded by the municipal borders of Jersey City, including 24 acres (97,000 m2) created by land reclamation at Ellis Island and riparian areas.