Indentured servitude in continental North America began in the Colony of Virginia in 1609. Initially created as means of funding voyages for European workers to the New World, the institution dwindled over time as the labor force was replaced with enslaved Africans. Servitude became a central institution in the economy and society of many parts of colonial British America. Abbot Emerson Smith, a leading historian of indentured servitude during the colonial period, estimated that between one-half and two-thirds of all white immigrants to the British colonies between the Puritan migration of the 1630s and the Revolution came under indenture. For the colony of Virginia, specifically, more than two-thirds of all white immigrants arrived as indentured servants.