Dorchester was annexed by Boston in pieces beginning on March 6, 1804, and ending with complete annexation to the city of Boston after a plebiscite was held in Boston and Dorchester on June 22, 1869. As a result, Dorchester officially became part of Boston on January 3, 1870. This is also the historic reason that Dorchester Heights is today considered part of South Boston, not modern-day Dorchester, since it was part of the cession of Dorchester to Boston in 1804. Additional parts of Dorchester were ceded to Quincy (in 1792, 1814, 1819, and 1855) and portions of the original town of Dorchester became the separate towns of Hyde Park (1868 and later annexed to Boston in 1912), Milton (1662), and Stoughton (1726, itself later subdivided).