Industrialization, Immigration, and the Gilded Age
Industrial growth
Railroads, coal, steel, and oil, plus favorable courts and government subsidies, fueled rapid growth after the Civil War. Carnegie practiced vertical integration, controlling ore, coke, ships, and rail lines; Rockefeller practiced horizontal consolidation, merging refineries into a trust. The Sherman Antitrust Act (1890) was vague and was used against unions as often as against monopolies; the Interstate Commerce Act (1887) began federal railroad regulation.
Labor and cities
Wage work, long hours, and child labor produced unions: the Knights of Labor were inclusive but collapsed after Haymarket (1886); the AFL organized skilled craft workers for practical gains. The Great Railroad Strike (1877), Homestead (1892), and Pullman (1894) brought federal troops and court injunctions. Immigrant neighborhoods grew crowded; political machines traded services for votes, and the Pendleton Act (1883) created a merit-based civil service.
West, farmers, and immigration
The Homestead Act (1862) and the transcontinental railroad (1869) drew settlers and displaced Native peoples; the Dawes Act (1887) broke up tribal land. Farmers organized through the Grange and the Populist Party, whose Omaha Platform demanded free silver, a graduated income tax, and direct election of senators. Bryan's Cross of Gold campaign lost to McKinley in 1896. Immigration shifted from northern and western Europe toward southern and eastern Europe, prompting the Chinese Exclusion Act (1882) and later quota laws.
Traps. Vertical means owning the supply chain, horizontal means absorbing competitors, and the Gospel of Wealth is Carnegie's philanthropy rather than Social Darwinism.
Worked example. Rockefeller's rebates and combined refineries answer horizontal consolidation, not vertical integration.