Why was the population boom at the turn of the twentieth century important to American industrialization?

The population boom at the turn of the twentieth century provided a vast labor force that fueled American industrialization, enabling factories and industries to expand rapidly. This influx of workers, including immigrants seeking better opportunities, met the growing demand for labor in urban areas while also increasing consumer markets for industrial goods. Additionally, the population growth stimulated infrastructure development, such as transportation and housing, further supporting industrial growth. Overall, this demographic shift was crucial in transforming the U.S. into a leading industrial power.