The Irish slave trade began when James II sold 30,000 Irish prisoners as slaves to the New World. His Proclamation of 1625 required Irish political prisoners be sent overseas and sold to English settlers in the West Indies. By the mid 1600s, the Irish were the main slaves sold to Antigua and Montserrat. At that time, 70% of the total population of Montserrat were Irish slaves.
Ireland quickly became the biggest source of human livestock for English merchants. The majority of the early slaves to the New World were actually white.
The British captured Irish people and sold them as slaves, especially to the Caribbean and South America. In the first few years of American history there were more white slaves than black; most of them being Irish.