Which factor caused many Irish immigrants to come to the United States in the 19th century? A. U. S. policies that promoted Catholic immigration
B. A growing demand for farm labor in the American South
C. The collapse of Irish potato crops due to disease
D. The chance to buy huge plots of American land

C the Irish potato famin

Explanation:

C. The collapse of lrish potato crops due to disease

Explanation:

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.

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