https://en.wikipedia.org/wiki/Indentured_servitude
An indentured servant or indentured laborer is an employee (indenturee) within a system of unfree labor who is bound by a signed or forced contract (indenture) to work without pay for the owner of the indenture for a period of time. The contract often lets the employer sell the labor of an indenturee to a third party. Indenturees usually enter into an indenture for a specific payment or other benefit (such as transportation to a new place), or to meet a legal obligation, such as debt bondage. On completion of the contract, indentured servants were given their freedom, and occasionally plots of land. Indentured servitude was often brutal, with a high percentage[vague] of servants dying prior to the expiration of their indentures. In many countries, systems of indentured labor have now been outlawed, and are banned by the Universal Declaration of Human Rights as a form of slavery.
In fact, experts estimate that over 52,000 British prisoners were shipped off to colonial America.
Britain had been shipping convicts to America for decades before they started sending them to Australia. In fact, it was precisely because of America’s fight for independence that the Brits had to start sending their criminals to Australia. But from 1718 until 1775, convict transportation to the American colonies flourished. Some estimates claim that almost 10 percent of migrants to America during this time were British convicts.
https://gizmodo.com/britain-sent-thousands-of-its-convicts-to-ameri...