A military alliance during World War I consisting of:
Germany
Austria-Hungary
The Ottoman Empire
Bulgaria
The coalition opposing the Central Powers, including:
Great Britain
France
Russia (until 1917)
Italy
Japan
Later, the United States
A British passenger ship sunk by a German U-boat in 1915.
Killed 1,198 people, including 128 Americans.
The event fueled anti-German sentiment in the U.S. and moved the country closer to war.
A 1916 promise by Germany to the United States to stop unrestricted submarine warfare.
Germany would only attack military vessels.
This pledge was later broken by Germany.
President Woodrow Wilson initially sought to keep the U.S. neutral in World War I.
Promoted a policy of moral diplomacy that encouraged democracy and peace without direct involvement in the war.
German submarines used during World War I to attack enemy ships, including civilian and neutral vessels.
Germany’s policy of sinking all ships, including neutral and passenger ships, in war zones without warning.
This policy was a key factor in the U.S. decision to enter the war.
A secret message sent in 1917 by Germany to Mexico.
Proposed a military alliance against the U.S. in exchange for Mexico regaining lost territories (Texas, New Mexico, Arizona).
Its interception and publication outraged Americans and helped push the U.S. into war.
A government propaganda agency created in 1917.
Aimed to build public support for the war effort through:
Posters
Speeches
Films
Press releases
Head of the CPI, who used propaganda to rally American support for the war.
A wartime agency led by Herbert Hoover.
Encouraged food conservation through voluntary measures like:
"Meatless Mondays"
"Wheatless Wednesdays"
Aimed to support the war effort.
Director of the Food Administration during World War I.
Later became the 31st president of the United States.
Laws that criminalized anti-war activities, criticism of the government, and interference with military recruitment.
Used to silence dissent during the war.
Socialist leader and vocal opponent of World War I.
Arrested under the Espionage Act for delivering an anti-war speech.
Sentenced to ten years in prison.
A Supreme Court case that upheld the Espionage Act.
Ruled that speech creating a “clear and present danger” (such as encouraging draft resistance) was not protected under the First Amendment.
A legal doctrine established in Schenck v. United States.
Justified restrictions on free speech if it posed an immediate threat to national security.
The U.S. military force sent to Europe in 1917.
Commanded by General John J. Pershing.
Played a decisive role in ending World War I.
Son of former President Theodore Roosevelt.
Served as a pilot in the AEF and was killed in combat in 1918.
Became a symbol of American sacrifice.
President Wilson’s 1918 plan for postwar peace.
Promoted principles such as:
Self-determination
Free trade
Open diplomacy
Creation of a League of Nations
The idea that ethnic groups and nations should have the right to govern themselves.
A key principle in Wilson’s 14 Points.
A controversial provision of the League of Nations covenant.
Required member nations to defend each other in case of attack.
U.S. opposition to Article X led to the rejection of the League.
The peace treaty that ended World War I.
Imposed harsh penalties on Germany, including:
Territorial losses
Military restrictions
Heavy reparations
The U.S. Senate, led by opposition from isolationists and Republicans, rejected the treaty.
Concerns were primarily over the League of Nations and entangling alliances.
A group of U.S. senators who completely opposed the Treaty of Versailles and the League of Nations.
Rejected any form of compromise.
A faction of senators, led by Henry Cabot Lodge.
Willing to support the Treaty of Versailles only if changes were made, particularly to Article X.
A Republican senator and fierce critic of Wilson.
Led opposition to the League of Nations, arguing it would undermine U.S. sovereignty.
The overthrow of Russia’s czar.
Led to the rise of the Bolsheviks and the establishment of a communist government under Lenin.
Fueled fears of communism spreading to the U.S.
A period of intense fear of communism and radical political movements in the U.S.
Triggered by labor strikes, anarchist bombings, and the Russian Revolution.
U.S. Attorney General who led a crackdown on suspected communists and radicals during the First Red Scare.
Known for his aggressive stance against leftist groups.
A series of government raids authorized by A. Mitchell Palmer.
Aimed to arrest suspected anarchists, communists, and radicals.
Often violated civil liberties and resulted in mass deportations.