Irish people
The population of Ireland is about 6.3 million, but it is estimated that 50 to 80 million people around the world have Irish forebears, making the Irish diaspora one of the largest of any nation. Historically, emigration from Ireland has been the result of conflict, famine and economic issues. People of Irish descent are found mainly in English-speaking countries, especially Great Britain, the United States, Canada and Australia. There are also significant numbers in Argentina, Mexico and New Zealand. The United States has the most people of Irish descent, while in Australia those of Irish descent are a higher percentage of the population than in any other country outside Ireland. Many Icelanders have Irish and Scottish Gaelic forebears.
Demography of Northern Ireland
Like Great Britain (but unlike most of the Republic of Ireland), Northern Ireland has a plurality of Protestants (48% of the resident population are either Protestant, or brought up Protestant, while 45% of the resident population are either Catholic, or brought up Catholic, according to the 2011 census) and its people speak dialects of English heavily influenced by the Scots language. This is both because of historic links with Scotland going back centuries, and because of settlements of lowland Scots Protestants in Ulster in the 17th century, such as the Plantation of Ulster. Also unlike the Republic, a large proportion of people in Northern Ireland have a British national identity. Many people in Northern Ireland have a Northern Irish identity, whether in addition to a British or Irish identity or by itself.