the mass emigration of the irish in the mid-19th century was primarily a result of
Irish Americans From 1820 to 1860, 1,956,557 Irish arrived, 75% of these after the Great Irish Famine (or The Great Hunger, Irish: An Gorta Mór) of 1845–1852, struck.[32]
Irish Canadians Today, the impact of the heavy 19th-century Irish immigration to Ontario is evident as those who report Irish extraction in the province number close to 2 million people or almost half the total Canadians who claim Irish ancestry. In 2004, March 17 was proclaimed “Irish Heritage Day” by the Ontario Legislature in recognition of the immense Irish contribution to the development of the Province.