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After Japan's attack on Pearl Harbor in 1941, the U.S. entered World War II on the Allied side.
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It is generally accepted that the first inhabitants of North America migrated from Siberia.
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European settlers also began trafficking African slaves into Colonial America.
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After 1820, cultivation of the highly profitable cotton crop exploded in the Deep South.
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After the American Civil War, new transcontinental railways made relocation easier for settlers.
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The United States remained neutral from the outbreak of World War I in 1914 until 1917.
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The growing civil rights movement used nonviolence to confront racism.
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President George W. Bush launched the war on terror, which included a nearly 20-year war in Afghanistan.
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The supervolcano underlying Yellowstone National Park in the Rockies is the continent's largest volcanic feature.
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It is a representative democracy "in which majority rule is tempered by minority rights protected by law."
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Prostitution is only legal in several counties of Nevada.
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Though Taiwan does not have formal diplomatic relations with the U.S., it maintains close, if unofficial, relations.
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In 2019, the total prison population for those sentenced to more than a year was 1,430,800.
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General Motors held the title of the world's best-selling automaker from 1931 to 2008.
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In Puerto Rico, Spanish is more widely spoken than English.
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The country also has by far the most Nobel Prize winners in history, with 403 (having won 406 awards).
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The United States is considered to have the strongest protections of free speech of any country.
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Hollywood, a northern district of Los Angeles, California, is the leader in motion picture production.
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Jazz was developed by innovators such as Louis Armstrong and Duke Ellington early in the 20th century.
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Baseball has been regarded as the U.S. national sport since the late 19th century.
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