European Emigration to the U.S. 1851 - 1860
Although the Irish potato blight receded in 1850, the effects of the famine continued to spur Irish emigration into the 20th century. Still facing poverty and disease, the Irish set out for America where they reunited with relatives who had fled at the height of the famine.
Background
Between 1845 and 1850, a devastating fungus destroyed Ireland's potato crop. During these years, starvation and related diseases claimed as many as a million lives, while perhaps twice that number of Irish immigrated 500,000 of them to the United States, where they accounted for more than half of all immigrants in the 1840s. Between 1820 and 1975, 4.7 million Irish settled in America. In 2002, more than 34 million Americans considered themselves to be of Irish ancestry, making Irish Americans the country's second-largest ethnic group.
The "Famine Irish" represented the first major influx of Irish immigration into America.
Source: Destination America by Charles A. Wills
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