Chapter 35

Pearl Harbor transformed the United States almost overnight from a divided, isolationist nation into a fully mobilized war machine. The War Production Board coordinated the conversion of civilian factories to military production, and automobile plants soon turned out tanks and bombers instead of cars.

The government financed the enormous cost of the war through steeply increased taxes and the mass sale of war bonds, while agencies such as the Office of Price Administration imposed rationing on gasoline, sugar, meat, and rubber to conserve scarce resources for the fight overseas.

With millions of men serving overseas, American women flooded into defense plants and shipyards to build the tanks, planes, and ships the war demanded, symbolized by the iconic figure of "Rosie the Riveter." Roughly six million women entered the paid workforce for the first time, challenging prewar assumptions about women's proper roles, even though many were pushed back out of industrial jobs once the war ended.

Black Americans, migrating north and west in a renewed Great Migration for wartime jobs, faced persistent discrimination in defense industries until civil rights leader A. Philip Randolph threatened a mass march on Washington, pressuring Roosevelt to issue Executive Order 8802 banning discrimination in defense employment. Nearly one million Black Americans served in a still-segregated military, including the celebrated Tuskegee Airmen.

Amid wartime hysteria and long-standing racial prejudice, President Roosevelt signed Executive Order 9066 in February 1942, authorizing the forced removal of roughly 120,000 Japanese Americans, most of them U.S. citizens, from the West Coast to remote internment camps in the interior.

Uprooted from their homes, businesses, and farms with only days' notice and forced to sell possessions at ruinous losses, internees lived behind barbed wire under armed guard for years despite no evidence of disloyalty. The Supreme Court upheld the internment's constitutionality in Korematsu v. United States (1944), a decision widely condemned by later generations and one the government formally apologized for and paid reparations over decades later.

American industrial output during the war proved staggering, as factories churned out ships, tanks, and planes at a pace no other nation could match — a productive surge that finally, decisively ended the Great Depression by putting nearly every willing worker back on a payroll. Unemployment essentially vanished as the economy shifted entirely to a war footing.

This vast mobilization also accelerated migration to war-production centers in the West and South, reshaping the nation's demographic map, while labor unions largely honored no-strike pledges in exchange for guaranteed union membership and government-backed wage arbitration.

After early Japanese conquests across the Pacific and Southeast Asia, the U.S. Navy halted Japan's momentum decisively at the Battle of Midway in June 1942, sinking four irreplaceable Japanese aircraft carriers and shifting naval superiority to the Americans. From there, U.S. forces under commanders like Douglas MacArthur and Chester Nimitz pursued a costly strategy of "island hopping," seizing key strategic islands while bypassing heavily fortified ones.

Brutal fighting at Iwo Jima and Okinawa in 1945 produced staggering casualties on both sides and gave American planners a grim preview of what a full invasion of the Japanese home islands might cost, directly shaping the eventual decision to use the atomic bomb.

After clearing North Africa and invading Italy, the Allies launched the largest amphibious invasion in history on June 6, 1944 ("D-Day"), storming the beaches of Normandy, France, under the command of General Dwight D. Eisenhower. Despite horrific casualties, especially at Omaha Beach, the invasion succeeded in establishing a crucial foothold for liberating Western Europe.

Allied forces pushed steadily eastward through France and the Low Countries, weathering a fierce German counterattack at the Battle of the Bulge that winter, while the Soviet Red Army ground relentlessly westward from the other direction, crushing the Nazi war machine between two advancing fronts.

In February 1945, with victory in sight, Roosevelt, Churchill, and Soviet leader Joseph Stalin met at the Yalta Conference to plan the postwar order, agreeing on the division of Germany into occupation zones, Soviet entry into the Pacific war, and the framework for a new United Nations organization — though Stalin's promises regarding free elections in Eastern Europe would soon prove hollow, planting seeds of the coming Cold War.

Roosevelt did not live to see the war's end, dying suddenly in April 1945 and leaving Vice President Harry S. Truman to assume the presidency. Germany finally surrendered unconditionally on May 8, 1945 ("V-E Day"), after Hitler's suicide amid the ruins of Berlin, ending the war in Europe.

With Europe secured, Allied attention turned fully to defeating Japan, whose military leadership remained determined to fight on despite mounting, catastrophic losses and the near-total destruction of its navy and air power.

The top-secret Manhattan Project had raced to develop an atomic weapon since 1942, and President Truman, weighing the immense projected casualties of a land invasion of Japan against the terrifying new weapon, ordered its use. American bombers dropped atomic bombs on Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945), killing well over 100,000 people, most of them civilians, in instants of unprecedented destruction.

Facing this devastation and the Soviet Union's simultaneous entry into the Pacific war, Japan announced its surrender on August 14, 1945, formalized aboard the USS Missouri on September 2, 1945 ("V-J Day"), finally ending the deadliest conflict in human history. The war's staggering costs and the dawn of the atomic age would define global politics for decades to come.