Using the theories of immigration, we got that a deadly potato famine is the major impetus for the huge Irish immigration to the united states after 1845.
Nearly two million Irish people came to the United States from the Ireland in the 1840s. Most of them actually crossed the ocean to escape the potato famine. Potatoes were the main crops grown by farmers in Ireland, and a fungus infestation devastated the crops nationwide in 1845.
Hence, the major impetus for the huge Irish immigration to the united states after 1845 was deadly potato famine.
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