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The Irish came to America from years 1845 - 1849 because of the Potato Famine. The Irish Potato Famine was when tons of potato crops were infected with a fungus that killed more than a million people, and caused another couple million to move to America.

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The Dominican Republic, French, and Europeans
Catholics, nationalists,and unionists

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Most of the older theories are being disproved by the current DNA studies.

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Q: What were the major groups of people that came across Ireland and when did they come?
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