The Industrial Revolution transformed America from 1870 to 1900. Rapid industrialization, technological advancements, and big business growth reshaped the economy. Cities expanded as immigrants flocked to factories, while labor unions fought for workers' rights. This era saw the rise of influential figures like Carnegie and Rockefeller. New inventions like the telephone and light bulb revolutionized daily life. However, the period also brought challenges like poor working conditions, income inequality, and environmental issues.