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A term coined during World War I for the psychological and neurological symptoms suffered by soldiers exposed to prolonged artillery bombardment and trench warfare.
Symptoms included: uncontrollable trembling, paralysis, mutism, nightmares, amnesia, and emotional collapse. Soldiers were often accused of cowardice or malingering.
The British Army alone diagnosed over 80,000 cases. We now recognize it as a form of PTSD — Post-Traumatic Stress Disorder.
A mental health condition triggered by experiencing or witnessing a terrifying event. Symptoms include flashbacks, nightmares, severe anxiety, and uncontrollable thoughts about the event.
The term did not exist in World War I. Sufferers were often labeled as cowards. PTSD was formally recognized as a medical diagnosis only in 1980, largely due to Vietnam War veteran advocacy.
A secret diplomatic message from German Foreign Secretary Arthur Zimmermann to the German ambassador in Mexico, proposing a military alliance against the United States.
In exchange, Germany promised to help Mexico recover Texas, New Mexico, and Arizona. British intelligence intercepted and decoded the telegram, then shared it with the U.S.
Its publication in American newspapers in March 1917 caused enormous public outrage and helped shift opinion toward entering the war.
Charles Schenck was the general secretary of the Socialist Party. He mailed 15,000 anti-draft pamphlets to men who had been called up for military service, arguing the draft was unconstitutional.
He was convicted under the Espionage Act. The Supreme Court unanimously upheld the conviction, with Justice Holmes writing the famous "clear and present danger" standard.
The decision remained precedent for decades. The modern standard — set in Brandenburg v. Ohio (1969) — is considerably more protective of political speech.
Created by executive order in April 1917, the CPI was the United States' first large-scale government propaganda agency, headed by journalist George Creel.
Its methods included: patriotic posters, pro-war pamphlets distributed by the millions, short films and newsreels, and 75,000 "Four Minute Men" — trained speakers who gave brief pro-war talks at movie theaters, churches, and public gatherings.
The CPI also promoted hostility toward German Americans, contributing to widespread social persecution.
Eugene Debs was a prominent socialist leader and five-time presidential candidate. In June 1918, he gave a speech in Canton, Ohio, criticizing the war and supporting men who had resisted the draft.
He was arrested under the Espionage Act, convicted, and sentenced to ten years in federal prison. He ran for president again in 1920 — from his prison cell — and received nearly one million votes.
President Harding commuted his sentence in 1921. Debs's case remains one of the most cited examples of wartime suppression of political speech in U.S. history.
A set of principles for the postwar peace settlement delivered by Wilson in a speech to Congress in January 1918. Key proposals included freedom of the seas, arms reduction, self-determination for colonized peoples, open diplomacy, and a League of Nations.
Europeans greeted Wilson ecstatically when he arrived at the Paris Peace Conference. However, Britain and France were determined to punish Germany. The resulting Treaty of Versailles bore little resemblance to Wilson's vision.
The U.S. Senate refused to ratify the treaty. The League of Nations was formed without American membership.