What sparked irish immigration to the united states in the mid-1840s?
overcrowding, jobs on ellis island, famine, an outbreak of disease

The answer is "famine".

In the mid-1840s, the potato crops, which were the base of the Irish people diets, were distroyed by a blight, a plant disease.

The hunger forced people to emigrate, mainly to North America. They had no skills, no money, few belongings and most had no education.

well i'm late but i think its: b, c, and e

answer; /// i believe that the correct answer is ; /// renaissance,printing press, age of exploration and protestant reformation;