Final answer:
Industrial capitalism as a key pull factor for US immigrants in the 1800s.
Explanation:
Industrial capitalism was the most crucial pull factor for immigrants to the US between 1880 and 1920. Immigrant workers sought opportunities in large industrial complexes, aiming to find work in America's growing industries such as steel and textiles. The influx of immigrants was driven by the availability of jobs and the economic prospects presented by industrialization.
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