How did rich and poor Americans contribute to the creation of a new economy at the end of the 19th century?

At the end of the 19th century, rich Americans, including industrialists and financiers, fueled the creation of a new economy through investments in infrastructure, technology, and the rise of corporations. Their wealth facilitated the expansion of industries like steel, railroads, and oil, driving urbanization and job creation. Meanwhile, poor Americans, often working in factories or as laborers, provided the necessary workforce for these burgeoning industries, while also advocating for labor rights and reforms. Together, these groups shaped a rapidly evolving economic landscape characterized by industrial growth and increasing social stratification.