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  Growth of railroads, mining, ranching and cattle industry boom, farming and agricultural innovation, and conflict with native americans.
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  Industrialization, monopolies, Andrew Carnegie, immigration, and urbanization.
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  U.S. expansion overseas, Spanish American War 1898, Annexation of Hawaii, and Teddy Roosevelt.
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  Democratic reforms, regulation of monopolies, consumer protection, environmental conservation, women's suffrage: 19th amendment, and prohibition.
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  Lusitania, Zimmerman Telegram, Trench warfare, Woodrow Wilson, and League of Nations.
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  Jazz Age, Flappers, Prohibition, The "new" KKK, and Scopes Trial
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  Stock market crash, high unemployment, Herbert Hoover, and Franklin D. Roosevelt's New Deal.
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  Pearl Harbor, Holocaust, Adolf Hitler, Europe and the Pacific, and atomic bomb.
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  Soviet Union, Communism, Containment, arms race, space race - Sputnik 1957, and Espionage (spies).
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  Martin Luther King, Jr. , Rosa Parks, Sit Ins, and Brown vs. Board of Education.
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  Part of the Cold War, U.S. supported South Vietnam against communist North Vietnam, Lyndon B. Johnson, Draft, and Antiwar Movement.
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  Inflation, Oil Crisis, Conservative Resurgence, End of Cold War, and Technological Revolution.
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  Globalization, 9/11 Terrorist Attacks, War on Terror, Hurricane Katrina, 2008 Economic Recession, and Election of Barak Obama