(1939-1945): The Second World War - Context, Conflict, and Consequences , and the Post-War Order

Interwar Foreign Policy and the Republican Administrations (1920-1933)

  • The Harding Administration (1921-1923):     * Characterized by political isolationism, aiming to distance the U.S. from entangling international commitments following the Great War.     * Secretary of State Charles Evans Hughes, an economic internationalist, collaborated with Secretary of Commerce Herbert Hoover and Secretary of Treasury Andrew Mellon to craft policy allowing global economic engagement while maintaining diplomatic autonomy.     * Washington Disarmament Conference (1921-1922): Responded to public demand for reduced military spending. Resulted in the Five Power Treaty signed by the U.S., Great Britain, Japan, France, and Italy.     * Established limits on naval armament to prevent an arms race.     * Defense spending in the 1920s and 1930s averaged only 1 %−2 %1\,\%-2\,\% of the nation's Gross Domestic Product (GDP).

  • The Coolidge Administration (1923-1929):     * Balanced commercial expansion with adherence to the Monroe Doctrine and avoidance of entangling alliances.     * Key figures: Secretary of State Charles Evans Hughes, Secretary of State Frank B. Kellogg, Andrew Mellon, and Herbert Hoover.     * Supported joining the World Court, though Congress rejected the proposal.     * Addressed European financial instability through the efforts of Charles Dawes and Owen Young.     * Kellogg-Briand Pact (1928): An agreement between the U.S. and France (later ratified by 6262 nations) to renounce war as a tool of national policy. It proved ineffective as defensive wars remained permissible.

  • The Hoover Administration (1929-1933):     * Policy influenced by the Great Depression; Hoover attributed U.S. economic struggles to global instability, particularly in Europe.     * Japanese Aggression in Manchuria (September 1931): Japan invaded Manchuria, violating Chinese sovereignty and the Kellogg-Briand Pact.     * Stimson Doctrine: Articulated by Secretary of State Stimson, asserting that territorial acquisitions achieved through aggression would not be recognized under international law. The League of Nations supported this in November 1931, but Japan ignored the resolution and established a puppet government.

Roots of the Second World War and Failure of International Order

  • Economic and Political Instability:     * Economic instability caused by the Treaty of Versailles and the Great Depression fostered extremist ideologies.     * Germany: Resentment over harsh reparations led to the rise of Adolf Hitler and the Nazi Party.     * Italy: Economic hardship led to the rise of Benito Mussolini and his fascist regime, emphasizing militarism.     * Japan: Resource scarcity drove militaristic leaders to pursue aggressive territorial expansion in Asia.

  • Weakness of the League of Nations:     * The absence of the United States (due to Senate refusal to ratify the Treaty of Versailles) deprived the League of significant economic and military influence.     * Lacked a standing military force, relying on voluntary troop contributions from member states.     * Requirement for unanimous decisions led to frequent deadlocks.

FDR’s Foreign Policy and the Neutrality Era (1933-1939)

  • Isolationist Sentiment:     * FDR’s first term focused on the New Deal and the Great Depression. He largely refrained from an internationalist agenda due to public sentiment.     * Nye Committee (1934-1936): Led by Senator Gerald Nye, investigated financial motives behind U.S. involvement in WWI, fueling public distrust of the arms industry.

  • The Neutrality Acts:     * Neutrality Act of 1935: Prohibited American ships from carrying arms to any belligerent (response to the sinking of the Lusitania).     * Neutrality Act of 1936: Prohibited loans or credits to belligerents.     * Neutrality Act of 1937: Explicitly prohibited all arms trade.

  • The Good Neighbor Policy:     * Prioritized mutual respect and non-intervention in Latin America.     * Montevideo Conference (December 1933): Secretary of State Cordell Hull endorsed a declaration that no state has the right to intervene in the affairs of another.     * Repealed the 19031903 treaty with Cuba based on the Platt Amendment.

  • Shift Toward Internationalism:     * Quarantine Speech (1937): Delivered in Chicago, FDR called for a "quarantine" of aggressive nations. Strong isolationist backlash forced him to adopt a more covert approach to international threats thereafter.

The Road to War and U.S. Preparedness (1939-1941)

  • Outbreak of War:     * Axis Powers: Germany, Italy, and Japan (bound by the Anti-Comintern Pact and Pact of Steel).     * German-Soviet Non-Aggression Pact (August 1939): Between Hitler and Stalin to divide Poland and avoid a two-front war.     * Invasion of Poland (September 1, 1939): Germany from the West, Soviets from the East. Britain and France declared war on September 3, 1939.     * FDR's Fireside Chat (September 3, 1939): Stated that while the U.S. would remain neutral, Americans could not be asked to remain neutral in thought or conscience.

  • FDR’s "Finest Hour":     * Strategic foresight by initiating correspondence with Winston Churchill (then First Lord of the Admiralty) shortly after the Polish invasion.     * George C. Marshall: Appointed Chief of Staff of the U.S. Army. He transformed the small, poorly equipped army (comparable to the Dutch Army) into a force that increased more than 1010-fold by 1942.

  • Escalation of Aid:     * Neutrality Act of 1939: Renewed "Cash and Carry" and expanded it to include arms sales.     * Destroyers for Bases Agreement (September 2, 1940): Exchanged 5050 aging U.S. destroyers for rights to military bases in Newfoundland, Bermuda, and the Caribbean.     * Selective Service Act (September 16, 1940): The first peacetime draft in U.S. history.     * Four Freedoms Speech (January 6, 1941): Outlined essential freedoms: speech, worship, from want, and from fear.     * Lend-Lease Act (March 11, 1941): Allowed the U.S. to lend or lease military equipment to nations vital to U.S. security (Britain, later the USSR and China).

  • The Atlantic Charter (August 1941):     * Meeting between FDR and Churchill off the coast of Newfoundland.     * Established shared principles: self-determination, economic cooperation, defeat of Nazi tyranny, and collective security.

Pearl Harbor and Total War Mobilization

  • The Attack (December 7, 1941):     * "Day of Infamy": Surprise Japanese assault on Pearl Harbor.     * Losses: 88 battleships sunk or damaged (including U.S.S. Arizona and U.S.S. Oklahoma), 1010 other ships, and 188188 planes. Over 2,5002,500 Americans killed; 1,1001,100 wounded.     * Three U.S. aircraft carriers were spared as they were at sea.     * Declaration of War: Approved with only one dissenting vote. Germany and Italy declared war on the U.S. three days later.

  • The War Powers Act (1941):     * Granted extensive authority to FDR to direct the war effort and create "alphabet agencies."     * War Production Board (1942): Overseeing resource allocation.     * Office of War Mobilization (1943): Streamlining war agencies.

  • Arcadia Conference (December 1941 - January 1942):     * Joint Anglo-American organization (Combined Chiefs of Staff) established.     * "Germany First" Strategy: Focus on stopping Germany first while maintaining enough resistance to stall Japan in the Pacific.

The Arsenal of Democracy and Industrial Innovation

  • Automotive Industry (Detroit):     * Ford Motor Company: Edsel Ford led the Willow Run plant to produce B-24 bombers at an unprecedented rate, plus jeeps and tanks.     * General Motors and Chrysler: Manufactured tanks, trucks, aircraft parts, and electronics.

  • Henry J. Kaiser and Shipbuilding:     * Revolutionized production with the "Liberty" ship design and assembly-line methods.     * Produced 2,7512,751 Liberty ships between 1941 and 1945. The Richmond, California, shipyard alone manufactured over 1,5001,500 cargo ships.

  • Scientific and Technological Advances:     * Mass production of penicillin (antibiotic).     * Development of DDT as an insecticide (malaria control in the Pacific).     * Creation of synthetic rubber to address shortages.     * The Manhattan Project: Directed by J. Robert Oppenheimer at Los Alamos and led by Major General Leslie Groves. Developed the first atomic bombs between 1942 and 1945.

Financing the War and the Home Front

  • Federal Funding:     * Massive increase in income taxes and national debt via deficit spending.     * War Bonds: 8585 million Americans (out of a population of 132132 million) purchased bonds, contributing roughly $185\$185 billion to the war effort.

  • Economic Stability and Rationing:     * Office of Price Administration (OPA): Froze prices and rents at March 1942 levels.     * Compulsory Rationing: Required ration books for gasoline, sugar, meat, and rubber. Local rationing boards issued certificates for cars or typewriters.

Military Theaters and Diplomatic Strategy (1942-1945)

  • The Pacific Theater:     * Battle of Coral Sea (May 1942): First major naval defeat for Japan.     * Battle of Midway (June 1942): Pivotal victory enabled by code-breaking.     * Island Hopping Strategy: Authorized by the Joint Chiefs of Staff. General Douglas MacArthur focused on retaking the Philippines; Admiral Chester Nimitz focused on smaller key islands.

  • The European Theater:     * Operation Torch: Allied landings in North Africa (advocated by Churchill to hit the "soft underbelly" instead of northern France).     * Casablanca Conference (January 1943): FDR and Churchill committed to the "unconditional surrender" of Axis powers.     * Invasion of Italy: Aimed to dismantle the fascist regime and divert German forces from France.

  • Tehran Conference (November 1943):     * First meeting of the "Big Three" (FDR, Churchill, Stalin).     * Agreed on the D-Day invasion and Stalin's commitment to join the war against Japan after Germany's defeat.     * Root of the United Nations: FDR proposed "The Four Policemen" (U.S., Britain, China, USSR).

  • D-Day / Operation Overlord (June 6, 1944):     * Commanded by General Dwight Eisenhower; invasion of Normandy shores.     * Involved 156,000156,000 Allied troops. Heavy casualties at Omaha Beach (over 2,0002,000).

  • End of the European War:     * Battle of the Bulge (December 1944): Last major German offensive in Belgium; largest land battle in American military history.     * Liberation of Concentration Camps: Evidence of the Holocaust (murder of 66 million Jewish people and others).     * Yalta Conference (February 1945): Agreements on the division of Germany and Soviet influence in Manchuria. FDR died shortly after on April 12, 1945.

Experiences of Historically Marginalized Groups

  • African Americans:     * Military remained segregated (FDR refused integration to preserve morale).     * Over 11 million served; often assigned to non-combat/unskilled roles.     * Tuskegee Airmen: African American pilots who broke racial barriers in combat sorties over Europe.     * Double V Campaign: Demanding victory against fascism abroad and racism at home.     * Second Great Migration: Migration to defense industry hubs (Detroit, Chicago, Pittsburgh, Los Angeles, San Francisco).     * Executive Order 8802: Issued after pressure from A. Philip Randolph to integrate the defense industry.

  • Women:     * Workforce participation rose from 27 %27\,\% to nearly 37 %37\,\% between 1940 and 1945.     * Rosie the Riveter: Iconic symbol of women in defense industries (inspired by Rosie Willman Monroe).     * Military Auxiliaries: Women's Army Corps (WAC), WAVES (Navy), SPARS (Coast Guard), and WASP (Pilots).

  • Minority Groups and Discrimination:     * Native Americans: 44,00044,000 served in the military and 40,00040,000 in defense industries. Navajo Code Talkers created an unbreakable communication code.     * Latinos: Approximately 500,000500,000 served. Bracero Program (1942): Allowed Mexican workers short-term permits for agriculture and railroads. Racial tensions erupted in the Zoot Suit Riots (1943) in Los Angeles.     * Japanese Internment: Executive Order 90669066 (February 1942) forcibly relocated Japanese Americans to internment camps in CA, AZ, WA, OR, and AR. Upheld by the Supreme Court in Korematsu v. United States.     * LBGTQ+: Over 9,0009,000 issued "Section 8" blue discharges for homosexuality; labeled as sociopaths.     * Jewish Americans: Approximately 550,000550,000 served. U.S. government response to the Holocaust was limited, though the War Refugee Board was established in 1944.

The Truman Presidency and the End of the War

  • Decision to Use the Atomic Bomb:     * Military predicted 200,000200,000 American casualties if Japan was invaded.     * Postdam Conference (July 1945): Truman learned of the successful bomb test.     * Hiroshima (August 6, 1945): Enola Gay dropped the bomb; over 100,000100,000 killed.     * Nagasaki (August 9, 1945): Second bomb dropped.     * Japan Surrender (September 2, 1945): Formal surrender achieved under unconditional terms.

Post-War International Order and American Society

  • International Frameworks:     * Bretton Woods Conference (July 1944): Established the International Monetary Fund (IMF) and the International Bank (World Bank).     * Dumbarton Oaks Conference (1944): Laid the structure for the United Nations.

  • The GI Bill of 1944 (Servicemen’s Readjustment Act):     * Provided funds for college education, unemployment insurance, low-interest mortgages, and business loans.     * Fueled the post-war housing boom and expansion of the middle class.

  • Economic Transition:     * Surge in consumer demand for homes and cars after years of rationing.     * Housing shortage led to innovative mass-produced suburban communities like Levittown.

Questions & Discussion

  • Prompt Options provided in the lecture:     1. Assess American interwar foreign policy (1921-1939) under Harding, Coolidge, Hoover, and FDR.     2. To what extent were the Treaty of Versailles and the Great Depression the primary causes of WWII?     3. Assess the significance of FDR's decision to support Churchill/Britain before Pearl Harbor.     4. To what extent was industrial mass production the most significant reason for the Allied victory?     5. Evaluate FDR's diplomatic leadership in establishing the post-war order.     6. Examine changes/continuities for African Americans, women, or other historically marginalized groups during the war.