What was one of the main reasons that large numbers of irish moved to the united states in the 1840s? there was a widespread outbreak of the flu virus in ireland. there was a war going on at that time in ireland. ireland’s potato crop failed due to a disease. ireland was very overpopulated at that time.

the answer to your question is Ireland's  potato crops failed due to a disease

The answer is C.

This is because Ireland had a bad potato crop which failed due to disease.

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answer: the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims.

explanation:

i would also go with d hope u get it right