Final answer:
From 1860 to 1920, there was a notable shift in immigration patterns to the United States, with a surge in arrivals from southern and eastern European countries, aiding the industrialization of the nation.
Explanation:
From 1860 to 1920, there was a significant change in immigration patterns to the United States. Initially, immigrants came largely from European countries like Ireland and Germany, but between 1880 and 1910, there was a surge in arrivals from southern and eastern European nations such as Italy, Greece, Russia, and Poland. The influx of immigrants contributed to the labor force needed for the massive industrialization happening at the time.
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