Why were immigrants in the late 19 century welcomed by industrialists?

Immigrants in the late 19th century were welcomed by industrialists because they provided a vast and inexpensive labor force essential for rapid industrial expansion. These newcomers were often willing to work for lower wages than native-born workers, which helped keep production costs down. Additionally, the influx of immigrants supported the growing demand for labor in factories, railroads, and construction, enabling industrialists to maximize profits during a period of significant economic growth.