Scotch-Irish (or Scots-Irish) Americans are American descendants of Presbyterian and other Ulster Protestant Dissenters from the Irish province of Ulster who migrated to North America during the 18th and 19th centuries. While an estimated 36 million Americans (12% of the total population) reported Irish ancestry in 2006, and 6 million (2% of the population) reported Scottish ancestry, an additional 5.4 million (1.8% of the population) identified more specifically with Scotch-Irish ancestry. The term Scotch-Irish is used only in the United States, with people in Great Britain or Ireland who are of a similar ancestry identifying as Ulster Scots.