The event that set off the massive immigration to the United States from Europe was

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The revolts of 1848, also known as the Spring of Nations, were a series of liberal and nationalist uprisings that spread throughout Europe. Although they were largely unsuccessful in achieving their goals, they led to a wave of political refugees and immigrants leaving Europe and coming to the United States. This migration continued for several decades and resulted in a significant increase in the population of the United States.

The Event That Set Off the Massive Immigration to the United