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The period of rapid industrialization and urbanization in the United States that transformed the economy and society.
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The social movement in the United States that aimed to protect the natural environment and promote sustainable practices.
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The war between Great Britain and the 13 British colonies in North America, which led to the formation of the United States.
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The document that declared the 13 colonies as independent states from Great Britain and helped to inspire other revolutions around the world.
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The war between the Union and Confederacy that resulted in the abolition of slavery and the reunification of the United States.
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The executive order issued by President Abraham Lincoln that declared all slaves in Confederate-held territory to be free.
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The period after the Civil War when the federal government attempted to rebuild the South and ensure the rights of newly freed slaves.
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The global conflict that involved many of the world's major powers and led to significant changes in international relations.
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The social movement in the United States that aimed to secure equal rights and opportunities for women.
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The decade of economic prosperity and cultural change that followed World War I.
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The economic crisis that began in 1929 and lasted for over a decade, leading to widespread poverty and unemployment.
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The global conflict that involved many of the world's major powers and resulted in the defeat of Nazi Germany and the Empire of Japan.
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The series of missions and explorations that led to the first human landing on the moon in 1969, and helped to advance scientific knowledge and technological innovation.
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The social movement in the United States that aimed to end racial segregation and discrimination against African Americans.
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The conflict between North and South Vietnam that involved the United States and lasted from 1955 to 1975.
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The landmark legislation that prohibited discrimination on the basis of race, color, religion, sex, or national origin, and helped to ensure equal rights and opportunities for all Americans.
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The political scandal that led to the resignation of President Richard Nixon in 1974, and highlighted issues of government corruption and abuse of power.
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The period of political and military tension between the United States and the Soviet Union that lasted from the end of World War II until the early 1990s.
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The terrorist attacks on the World Trade Center and the Pentagon on September 11, 2001, which led to the War on Terror and significant changes in U.S. security policy.
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The healthcare reform law passed in 2010, which aimed to expand access to healthcare and reduce healthcare costs for Americans.