American industrialists were influential business leaders in the late 19th and early 20th centuries who played a key role in the country's economic growth. They were often involved in industries such as steel, oil, and railroads, helping to shape the modern American economy. Notable figures included Andrew Carnegie, who revolutionized the steel industry, and John D. Rockefeller, who dominated the oil market. These industrialists were known for their innovative practices and large-scale production methods. Their efforts contributed to the rise of capitalism in the United States, leading to the establishment of major corporations and the expansion of the workforce. Their legacies continue to impact American business today.