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The westward expansion included growth of railroads, mining, cattle and ranching industry boom, and conflict with native Americans.
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The Gilded Age included industrialization, monopolies, immigration, and urbanization.
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U.S. Imperialism included U.S. expansion overseas, Spanish American war in 1898, and the annexation of Hawaii
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The Progressive Era included democratic reforms, regulation of monopolies, and women's suffrage.
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World War I included trench warfare and the League of Nations.
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The Roaring Twenties included the Jazz Age, Prohibition, and the "KKK"
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The Great Depression included the stock market crash and high unemployment.
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World War II included the bombing of Pearl Harbor and the Holocaust
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The Cold War included communism, the Arms Race, and the Space Race.
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The Civil Rights Movement included Martin Luther King Jr. and his famous "I Have a Dream" Speech and Rosa Parks.
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The Vietnam War was a part of the Cold War, the U.S. supported South Vietnam against communist North Vietnam
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The late 20th century included inflation, the oil crisis, and the end of the Cold War
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The U.S. in the 21st Century included globalization, 9/11 terrorist attacks, and the war on terror