10,000,000 Immigrants Move to the U.S.A Mostly From Europe (1860 to 1890) (dec 1, 1860 – dec 1, 1890)

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Mass immigration and industrialization from 1860 to 1890 saw over 10 million individuals arriving in the United States, predominantly from Europe. This era's surging population growth and workforce expansion were viewed through the lens of Social Darwinism, which some used to justify the prevailing economic disparities and harsh working conditions as a natural selection process within a capitalist society. Conversely, the Progressive movement emerged as a response, advocating for reforms and greater government intervention to "uplift" workers and ensure fair treatment.

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