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The Allied Powers joined forces to fight against the Axis nations. Britain, the United States, and the Soviet Union formed the 'Big Three' alliance. Despite their differences, these nations shared resources, military equipment, and intelligence information. The United States provided crucial supplies through the Lend-Lease program, sending weapons and food to Britain and Russia. This cooperation meant the Axis powers faced enemies on multiple fronts, stretching their forces too thin. The Allies, especially America, had massive industrial power that became a war-winning advantage. Factories across the United States produced planes, tanks, ships, and ammunition faster than Germany or Japan could match. By 1944, America was building one ship every day and thousands of aircraft monthly. The Allies also controlled more natural resources like oil, steel, and rubber. Germany and Japan struggled with fuel shortages and couldn't replace their lost equipment quickly enough. The Soviet Union's fierce resistance on the Eastern Front drained Germany's military strength. After surviving the initial German invasion, Soviet forces pushed back with enormous armies and determination. The Eastern Front forced Germany to commit most of its troops and resources to fighting Russia. This meant fewer German soldiers could defend Western Europe from British and American forces. The Soviet advance toward Berlin from the east, combined with Allied advances from the west, trapped Germany between two powerful armies. Several crucial battles shifted the war's momentum toward Allied victory. The Battle of Stalingrad (1942-1943) stopped Germany's advance into Russia, destroying an entire German army. The Battle of Midway (1942) crippled Japan's navy in the Pacific Ocean. D-Day (June 1944) saw Allied forces successfully invade Nazi-occupied France, opening a western front. These victories proved the Axis powers could be defeated and gave the Allies strategic advantages. Intelligence work and code-breaking gave the Allies secret advantages throughout the war. British mathematicians at Bletchley Park cracked Germany's Enigma code machine, allowing them to read secret Nazi messages. Americans broke Japanese naval codes before the Battle of Midway, helping them prepare an ambush. This intelligence helped Allied commanders predict enemy movements, protect supply convoys, and plan successful attacks while keeping their own plans secret. Controlling the skies became essential to winning the war on land and sea. The Allies developed better aircraft, radar systems, and trained more pilots than the Axis powers. Strategic bombing campaigns destroyed German factories, oil refineries, and transportation networks, weakening their war effort. Allied planes protected invasion forces and supply ships crossing the oceans. New technologies like the atomic bomb, developed by the Manhattan Project, ultimately forced Japan's surrender in August 1945. | Chalk