More African Americans began moving to Seneca Village after slavery in New York state was outlawed in 1827. In the 1830s, people from York Hill were forced to move so that a basin for the Croton Distributing Reservoir could be built, so many of York Hill's residents migrated to Seneca Village. Later, during the Great Famine of Ireland, many Irish immigrants came to live in Seneca Village, swelling the village's population by 30 percent during this time. Both African Americans and Irish immigrants were marginalized and faced discrimination throughout the city. Despite their social and racial conflicts elsewhere, the African Americans and Irish in Seneca Village lived close to each other. By 1855, one-third of the village's population was Irish. George Washington Plunkitt, who later became a Tammany Hall politician, was born in 1842 to two of the first Irish settlers in the village, Pat and Sara Plunkitt. Richard Croker, who later became the leader of Tammany, was born in Ireland, but he came with his family to Seneca Village in 1846, and lived there until his father received a job that enabled them to move.