2. What event did you read about that could explain the massive increase in immigration between 1840 and 1860?
ncrease in immigration between 1841 - 1851?

In the mid-1840s population expansion and an active desire for more territory went together. With the conclusion of the Mexican War in 1848 came still more increased boundaries. “Manifest Destiny” contributed to increased migration into new regions, particularly into the Southwest.

jewish people, gypsies, and political opponents.

dont kniw hope this hepl you