Irish Celebrity Girl

Large populations of people of Irish ethnicity live in many western countries, particularly in English-speaking countries. Historically, emigration has been caused by politics, famine and economic issues. An estimated 50 to 80 million people make up the Irish diaspora today, which includes Great Britain, the United States, Australia, Canada, Argentina, Chile, Jamaica, Trinidad, South Africa, New Zealand, Mexico, France, Germany and Brazil. The largest number of people of Irish descent live in the United States—about ten times more than in Ireland itself.
However, it had been recognised that the estimated numbers of the Irish diaspora may be highly inaccurate; one reason is that the majority of ancestral censuses conducted within the United States and Canada record self-reported ancestry, which is often unreliable. The majority of people living within immigrated populations (i.e. Australia, United States, Canada etc.) are of mixed ancestry due to decades, at times centuries, of inter-marriage with other immigrants or indigenous populations, hence claiming one specific ancestry is often personal preference or perceived ancestry rather than fact.
The author Jim Webb suggests that a large number (he suspects near half) of those claiming Irish-American ancestry, especially among Protestants, may be Scots Irish (that is, descendents of Scottish people who populated the Irish province of Ulster)