From 1866 to 1915, around 25 million immigrants came to America, attracted to economic opportunities that the United States had to offer. Opportunistic labor-recruiting agents, steamship companies, and land-grant railroads all solicited labor overseas, advertising their abundant employment opportunities.
What was the main reason for the massive influx of immigrants to the United States from 1866 to 1915?
a desire for economic betterment
Immigrants were enticed by all the economic opportunities in the United States.