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The Irish Famine was the reason. Back then Ireland depended on the potato for food and then all of them got diseased with blight which made them deadly to eat. As well as 1.5 million emigrating around the same amount of people died of starvation.

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Q: Between 1846 and 1855 the population of Ireland decreased by a third including approximately 15. million Irish immigrants who left for the US. what was the primary reason for this migration?
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