The major factor that led to a flood of Irish immigrants to the U.S. in the 1840s and 1850s is the potato famine which led to starvation and the deaths of almost half of the Irish population.
Industry and trade grew rapidly, in the northwest, during the 19th century, due to the large population of immigrants. The convenient trade routes to Europe also contributed.
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It is not true that all late 19th century and early 20th century immigrants came from Europe. While a large number of immigrants did come from European countries, there were also immigrants from other parts of the world, such as Asia.
developments in transportation
all the answers are correct
Increased tensions over slavery
Immigrants from Mexico.
New York
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technological advances an war
Where did large numbers of European immigrants settle during the late 19th century
The river steamboat, the telegraph, the cotton gin, and the iron plow