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The American Revolution was an epic political and military struggle waged between 1765 and 1783 when 13 of Britain's North American colonies rejected its imperial rule. The protest began in opposition to taxes levied without colonial representation by the British monarchy and Parliament.
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The War of 1812 was fought between the United States and Great Britain from 1812 to 1815, triggered by British restrictions on American trade, the impressment of American sailors, and British support for Native American resistance to American westward expansion.
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The American Civil War (1861–1865) was fought between the United States (the Union) and eleven Southern states that seceded to form the Confederate States of America.
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World War I (1914-1918) was a global conflict sparked by the assassination of Archduke Franz Ferdinand, which escalated through a complex web of alliances and rivalries among European powers.
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The Korean War was a conflict from 1950–1953 fought between North Korea (supported by the Soviet Union and China) and South Korea (supported by the United States and the United Nations).
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The Vietnam War was a conflict from November 1, 1955, to April 30, 1975, that pitted the communist North Vietnam against the anti-communist South Vietnam. The United States became deeply involved in the conflict to prevent the spread of communism, escalating military involvement from 1965 until its withdrawal in 1973, but the war eventually led to the unification of Vietnam under communist rule in 1975.
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he post-Cold War era, beginning in December 1991 with the Soviet Union's dissolution, is characterized by a unipolar world led by the United States, the spread of market economies, increased globalization, and a rise in non-state actors and complex, intra-state conflicts like terrorism and humanitarian crises.