History of the United States (1918–1945)

History of the United States (1918–1945)
Title	History of the United States (1918–1945)
Period	1918–1945
Major events	End of World War I; Treaty of Versailles; Red Scare; Prohibition; Roaring Twenties; Stock Market Crash of 1929; Great Depression; New Deal; Neutrality Acts; Lend-Lease; Attack on Pearl Harbor; United States entry into World War II; D-Day; Pacific island campaigns; Yalta Conference
Notable people	Woodrow Wilson; Warren G. Harding; Calvin Coolidge; Herbert Hoover; Franklin D. Roosevelt; Eleanor Roosevelt; Harry S. Truman; John J. Pershing; Dwight D. Eisenhower; Douglas MacArthur; Chester W. Nimitz; Joseph P. Kennedy Sr.; Al Smith; Huey Long; Charles Evans Hughes; William Howard Taft
Locations	Washington, D.C.; New York City; Chicago; San Francisco; Pearl Harbor; Normandy; Guadalcanal; Midway; Iwo Jima; Okinawa; Los Angeles

History of the United States (1918–1945) The period 1918–1945 in the United States spans the transition from World War I aftermath through the interwar years and the nation’s emergence as a global power during World War II. It encompasses domestic upheavals—political, social, and economic—and foreign engagements that reshaped institutions such as the League of Nations debates, the New Deal, and wartime alliances culminating at the Yalta Conference. Presidents from Woodrow Wilson to Franklin D. Roosevelt directed responses to crises including the Red Scare (1919–1920), the Great Depression, and total war.

End of World War I and Postwar Adjustment (1918–1920s)

The armistice ending World War I precipitated the Paris Peace Conference and the contentious Treaty of Versailles negotiations led by Woodrow Wilson and his Fourteen Points, while opponents such as Henry Cabot Lodge blocked Senate ratification. Returning veterans faced the transition monitored by the American Legion and demobilization policies influenced by John J. Pershing and the United States Army, while labor unrest saw strikes tied to figures like Eugene V. Debs and organizations like the American Federation of Labor. Political reactions included the Red Scare (1919–1920) prosecutions linked to the Palmer Raids under A. Mitchell Palmer and legislative responses exemplified by the Emergency Quota Act and the Immigration Act of 1924 debated in the halls with participants such as Calvin Coolidge and Warren G. Harding.

Social and Cultural Change (1920s–1930s)

The Roaring Twenties witnessed cultural shifts through the influence of Harlem Renaissance artists like Langston Hughes and Zora Neale Hurston, mass entertainment via Radio broadcasting networks and films produced by Metro-Goldwyn-Mayer and Warner Bros., and popular heroes such as Babe Ruth and Charles Lindbergh whose transatlantic flight energized aviation debates involving the Air Mail scandal. Social policies reflected tensions over Prohibition enforced by the Volstead Act and organized crime figures like Al Capone, while the revival of the Ku Klux Klan shaped politics in states contested by politicians including Al Smith and Huey Long. Intellectual currents included debates at institutions like Columbia University and literary movements associated with F. Scott Fitzgerald and Ernest Hemingway.

Economic Developments and the Great Depression (1929–1939)

The Stock Market crash of 1929 triggered a cascade of banking failures such as those affecting the Federal Reserve System and figures like Herbert Hoover faced mounting criticism as unemployment soared and events like the Bonus Army march pressed the federal response. New institutions and policies emerged as economists including John Maynard Keynes influenced American debates, while the Smoot–Hawley Tariff Act provoked international reactions involving trade partners such as Great Britain and France. Relief efforts at municipal and state levels intersected with private philanthropy from families like the Rockefeller family and organizations such as the Red Cross, all against the backdrop of cultural depictions in works by John Steinbeck and photographers of the Farm Security Administration.

New Deal Policies and Political Realignment (1933–1941)

Franklin D. Roosevelt’s New Deal launched agencies including the Civilian Conservation Corps, the Works Progress Administration, the Social Security Act administration, and the Tennessee Valley Authority reshaping federal-state relations contested by the U.S. Supreme Court and critics like Charles Coughlin and Huey Long. Legislative milestones such as the National Industrial Recovery Act and the Wagner Act intersected with labor organizing by the Congress of Industrial Organizations and strikes involving the United Auto Workers and leaders like John L. Lewis. Political realignment broadened the New Deal coalition to include urban ethnic voters, African American migration patterns involving Great Migration (African American) trends, and electoral shifts evident in the 1936 election contest between Alf Landon and Roosevelt.

Foreign Policy and the Road to World War II (1918–1941)

Postwar isolationism shaped debates over the League of Nations and neutrality legislation such as the Neutrality Acts (1930s), while rising threats from Nazi Germany, Imperial Japan, and Fascist Italy prompted shifts toward internationalism manifested in Lend-Lease under Roosevelt and diplomatic engagements like the Good Neighbor policy affecting relations with Mexico and Cuba. Incidents including the Quarantine Speech and events in China and Ethiopia pushed policymakers such as Cordell Hull and Joseph P. Kennedy Sr. into contentious roles, culminating in the Pacific attack on Pearl Harbor that resolved the debate and drew leaders including Winston Churchill and Joseph Stalin into allied strategy discussions.

World War II: Mobilization, Home Front, and Military Campaigns (1941–1945)

Following Attack on Pearl Harbor, mobilization produced the War Production Board, the Office of War Information, and the draft overseen by the Selective Service System, while industry giants like Henry J. Kaiser and William S. Knudsen coordinated production. Military strategy placed commanders such as Dwight D. Eisenhower, Douglas MacArthur, Chester W. Nimitz, and George S. Patton at the center of campaigns including Operation Overlord (D-Day), the Battle of Midway, the Guadalcanal Campaign, the Battle of the Bulge, and island assaults at Iwo Jima and Okinawa. The home front endured measures like Japanese American internment directed by Executive Order 9066 and scientific projects such as the Manhattan Project that introduced the Atomic bomb used at Hiroshima and Nagasaki, while wartime conferences at Tehran Conference and Yalta Conference shaped postwar institutions including the United Nations and positioned leaders Harry S. Truman and Franklin D. Roosevelt for the transition to peacetime governance.

Category:United States history by period