The coalition of nations, including France, Britain, Russia, Italy, and later the United States, that fought against the Central Powers during World War I.
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Central Powers
The alliance of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria that fought against the Allied Powers in World War I.
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HMS Lusitania
A British passenger ship sunk by a German U-boat in 1915, killing 1,198 people, including 128 Americans.
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Sussex Pledge
A promise made by Germany in 1916 to the U.S. that it would not sink merchant ships without warning.
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Zimmerman Telegram
A secret communication sent in 1917 from Germany to Mexico proposing an alliance against the U.S. in exchange for the return of lost territories.
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Russian/Bolshevik Revolution, 1917
A political revolution in Russia that led to the overthrow of the Tsar and the rise of the Bolsheviks.
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War Industries Board
A U.S. government agency created during World War I to coordinate industrial production and supply materials for the war effort.
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Espionage and Sedition Acts
Laws passed in 1917 and 1918 that restricted free speech during wartime.
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Schenck v. United States
A 1919 Supreme Court case that upheld the Espionage Act, ruling that speech creating a 'clear and present danger' was not protected by the First Amendment.
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Selective Service Act, 1917
A law that established a military draft in the U.S. during World War I.
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American Expeditionary Force (AEF)
The U.S. armed forces sent to Europe during World War I, led by General John J. Pershing.
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Fourteen Points
A set of principles proposed by President Woodrow Wilson in 1918 for postwar peace.
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Treaty of Versailles
The 1919 peace treaty that officially ended World War I, imposing heavy reparations on Germany.
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League of Nations
An international organization created after World War I to promote peace and cooperation among nations.
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Great Migration
The large-scale movement of African Americans from the rural South to northern cities between 1916 and 1970.
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Red Scare
A period of intense fear of communism and radical leftist ideas in the U.S. following World War I.
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Palmer Raids
A series of government raids in 1919-1920 led by Attorney General A. Mitchell Palmer to arrest suspected radicals.