AP US History Unit 6 Cheat Sheet

The basics

Time period: 1865–1898 (end of Reconstruction to the eve of the Spanish-American War)

Exam weight: About 10–17% of the AP US History exam

The big question: How did industrial capitalism transform American life — economically, socially, and politically — and how did Americans respond?

The key terms you must know

• Transcontinental Railroad — 1869 completion bound the nation together and accelerated westward expansion and industrial growth.
• Robber Barons / Captains of Industry — Carnegie, Rockefeller, Morgan, Vanderbilt; titans of steel, oil, banking, and railroads.
• Trust — Rockefeller-pioneered business arrangement enabling one entity to control multiple corporations — creating monopolies.
• Haymarket Affair — 1886 bombing during Chicago labor rally; destroyed the Knights of Labor and tied unions to radicalism in public opinion.
• Populism — 1890s farmer-led movement (People's Party); demanded free silver, government ownership of railroads, income tax, direct election of senators.

Key themes to remember

• Industrial capitalism made America rich and unequal — The biggest wealth boom in history happened alongside the worst poverty, child labor, and corruption.
• Labor and Populism challenged laissez-faire — and lost — Unions and the People's Party demanded change, but Gilded Age courts, presidents, and police usually sided with capital.
• Immigration transformed American cities — Southern and Eastern Europeans, Asians, and Black Americans migrating north reshaped urban America — and sparked the first major federal immigration restrictions.
• Westward expansion destroyed Native life — The closing of the frontier, the Dawes Act, and Wounded Knee marked the violent end of Nativ

  Common exam traps

  • "Robber barons" and "captains of industry" are the same people — Just labeled differently depending on the writer's view. Both terms refer to Carnegie, Rockefeller, etc.
  • The Sherman Antitrust Act was barely used against monopolies in the Gilded Age — It was used more against unions until Theodore Roosevelt revived it during the Progressive Era.
  • Populism failed but its ideas succeeded — The People's Party died after 1896, but income tax (16th Amendment), direct senator election (17th), and railroad regulation all happened in the Progressive Era.
  • The Dawes Act was assimilation policy, not Indian rights — It broke up tribal lands and tried to destroy Native culture. Don't confuse it with later, more genuine Indian rights efforts.
  • The "Gilded Age" was Mark Twain's insult, not a compliment — Gilded means thinly gold-plated. Twain meant the era was rotten beneath a shiny surface.
  ost-tested cause of conquest.
• Know the differences between Spanish, French, and English colonization — comparison questions are very common.
• The Pueblo Revolt (1680) shows Indigenous resistance succeeded, at least temporarily — don't portray Native peoples as passive.