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.
Ireland
The population of Ireland collapsed dramatically during the second half of the 19th century. A population of over 8 million in 1841 was reduced to slightly more than 4 million by 1921. In part, the fall in population was due to death from the Great Famine of 1845 to 1852, which took about 1 million lives. However, by far the greater cause of population decline was the dire economic state of the country which led to an entrenched culture of emigration lasting until the 21st century.