United States in World War I

United States in World War I
1917–1918
Two American soldiers run towards a bunker.
Location	United States
President(s)	Woodrow Wilson
Key events	Selective Service Act of 1917 Food and Fuel Control Act Conscription
Chronology Progressive Era Roaring Twenties

This article is part of a series on the
History of the United States
Timeline and periods Prehistoric and Pre-Columbian Era until 1607 Colonial Era 1607–1765 1776–1789     American Revolution 1765–1783     Confederation period 1783–1788 1789–1815     Federalist Era 1788–1801     Jeffersonian Era 1801–1817 1815–1849     Era of Good Feelings 1817–1825     Jacksonian Era 1825–1849 1849–1865     Civil War Era 1849–1865 1865–1917     Reconstruction Era 1865–1877     Gilded Age 1877–1896     Progressive Era 1896–1917 1917–1945     World War I 1917–1918     Roaring Twenties 1918–1929     Great Depression 1929–1941     World War II 1941–1945 1945–1964     Post-World War II Era 1945–1964     Civil Rights Era 1954–1968 1964–1980     Civil Rights Era 1954–1968     Vietnam War 1964–1975 1980–1991     Reagan Era 1981–1991 1991–2008     Post-Cold War Era 1991–2008 2008–present     Modern Era 2008–present
Topics American Century Antisemitism Civil unrest Racial violence Cultural Cinema Music Newspapers Sports Demography Immigration Economy Banking Education Higher education Flag Government Abortion Capital punishment Civil rights Corruption The Constitution Debt ceiling Direct democracy Foreign policy Law enforcement Postal service Taxation Voting rights Journalism Maritime Military Army Marine Corps Navy Air Force Space Force Coast Guard Party Systems First Second Third Fourth Fifth Sixth Religion Social class Slavery Sexual slavery Technology and industry Agriculture Labor Lumber Medicine Railway
Groups African American Asian American Chinese American Filipino American Indian American Japanese American Korean American Thai American Vietnamese American European American Albanian American English American Estonian American Finnish American German American Irish American Italian American Lithuanian American Polish American Serbian American Hispanic and Latino American Mexican American Jewish American Middle Eastern American Egyptian American Iranian American Iraqi American Lebanese American Palestinian American Saudi American Native Americans Cherokee Comanche Women LGBTQ Gay men Lesbians Transgender people
Places Territorial evolution Admission to the Union Historic regions American frontier Manifest destiny Indian removal Regions New England The South The West Coast States AL AK AZ AR CA CO CT DE FL GA HI ID IL IN IA KS KY LA ME MD MA MI MN MS MO MT NE NV NH NJ NM NY NC ND OH OK OR PA RI SC SD TN TX UT VT VA WA WV WI WY Territories DC AS GU MP PR VI Cities Urban history Cities
Outline List of years Historiography Category Portal
v t e

The United States declared war on Germany on April 6, 1917, nearly three years after World War I started. A ceasefire and armistice were declared on November 11, 1918. Before entering the war, the U.S. had remained neutral, though it had been an important supplier to the United Kingdom, France, and the other powers of the Allies of World War I.

The U.S. made its major contributions in terms of supplies, raw material, and money, starting in 1917. American soldiers under General of the Armies John Pershing, Commander-in-Chief of the American Expeditionary Force (AEF), arrived at the rate of 10,000 soldiers a day on the Western Front in the summer of 1918. During the war, the U.S. mobilized over 4.7 million military personnel and suffered the loss of over 116,000 soldiers.^[1] The war saw a dramatic expansion of the United States government in an attempt to harness the war effort and a significant increase in the size of the U.S. Armed Forces.

After a relatively slow start in mobilizing the economy and labor force, by spring 1918, the nation was poised to play a role in the conflict. Under the leadership of President Woodrow Wilson, the war represented the climax of the Progressive Era as it sought to bring reform and democracy to the world. There was substantial public opposition to U.S. entry into the war.