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.
Irish diaspora
The Government of Ireland defines the Irish diaspora as all persons of Irish nationality who habitually reside outside of the island of Ireland. This includes Irish citizens who have emigrated abroad and their children, who are Irish citizens by descent under Irish law. It also includes their grandchildren in cases where they were registered as Irish citizens in the Foreign Births Register held in every Irish diplomatic mission. Under this legal definition, the Irish diaspora is considerably smaller—some 3 million persons, of whom 1.47 million are Irish-born emigrants. Given Ireland's population of 4.85 million, this is still a large ratio.
However, the usage of "Irish diaspora" is generally not limited by citizenship status, thus leading to an estimated (and fluctuating) membership of up to 80 million persons—the second and more emotive definition. The Irish Government acknowledged this interpretation—although it did not acknowledge any legal obligations to persons in this larger diaspora—when Article 2 of the Constitution of Ireland was amended in 1998 to read ""[f]urthermore, the Irish nation cherishes its special affinity with people of Irish ancestry living abroad who share its cultural identity and heritage.""