A great many Ulster-Scots (Scotch-Irish) went to America during the colonial period as Indentured Servants. This was in lieu of payment of passage which could sometimes be the equivalent of three years earnings for a farm labourer. It's estimated almost half of European emigrants to America in the colonial period were indentured. These contracts lasted on average three to seven years in which the unpaid servant (or rather his labour) was owned by whomever buys it on arrival at port.
