Harbor Defenses of New York later became known as the first system of US seacoast fortifications. In New York this was initially limited to the large Fort Jay on Governors Island, along with some small batteries on Oyster Island (later Ellis Island) and Bedloe's Island (later Liberty Island). These were simple earthworks at the time. Congress contributed to building Fort Jay in 1797, and in 1800 the state sold the fort, Governors Island, and Bedloe's Island to the federal government for one dollar. Oyster Island was similarly transferred in 1808. The federal government commenced building improved stone forts at all three locations. In June 1807,
Liberty Island for ferry service to and from the island. At the time of European colonization of the Hudson River estuary in the mid-17th century, much of the west side of Upper New York Bay contained large tidal flats which hosted vast oyster beds, a major source of food for the Lenape native people who lived there at the time. Several islands were not completely submerged at high tide. Three of them (later known as Bedloe's/Love/Liberty, Ellis, and Black Tom) were given the name Oyster Islands ("oester eilanden") by the Dutch settlers of New Netherland, the first European colony in the Mid-Atlantic