After slavery in New York was abolished in 1827, freedmen settled in the area known since colonial times as Sandy Ground, which was located in the area around what is now the intersection of Bloomingdale and Woodrow Roads in Rossville. These early settlers were skilled in the oyster trade, and brought this knowledge with them to Staten Island. The island's main hub for oyster harvesting was Prince's Bay, within walking distance from the Sandy Ground community. Sandy Ground also served as an important stop on the Underground Railroad, and is the oldest continuously settled free black community in the United States. Oyster farming ended around 1916 due to water pollution in the harbor.