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Migration

The population of Ireland collapsed dramatically during the second half of the 19th century. A population of over eight million in 1841 was reduced to slightly over four million by 1921. In part, the fall in population was caused by death from the Great Famine of 1845 to 1852, which took roughly one million lives. The remaining decline of around three million was due to the entrenched culture of emigration caused by the dire economic state of the country, lasting until the late 20th century.

Emigration from Ireland in the 19th century contributed to the populations of England, the United States, Canada and Australia, in all of which a large Irish diaspora lives. As of 2006, 4.3 million Canadians, or 14% of the population, were of Irish descent, while around one-third of the Australian population had an element of Irish descent. As of 2013, there were 40 million Irish-Americans and 33 million Americans who claimed Irish ancestry.

With growing prosperity since the last decade of the 20th century, Ireland became a destination for immigrants. Since the European Union expanded to include Poland in 2004, Polish people have comprised the largest number of immigrants (over 150,000) from Central Europe. There has also been significant immigration from Lithuania, Czech Republic and Latvia.

The Republic of Ireland in particular has seen large-scale immigration, with 420,000 foreign nationals as of 2006, about 10% of the population. Nearly a quarter of births (24 percent) in 2009 were to mothers born outside of Ireland. Up to 50,000 eastern and central European migrant workers left Ireland in response to the Irish financial crisis.