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World War II began in September 1939 with Nazi Germany's invasion of Poland.Let's look at the key nations involved in the initial conflict.On September 1st, 1939, German forces launched their invasion of Poland.Let's compare the military strength of the forces involved.Britain and France declared war on Germany on September 3rd, but provided no immediate military assistance to Poland.On September 17th, the Soviet Union invaded Poland from the east, as agreed in the secret protocols of the Molotov-Ribbentrop Pact.Let's look at the key events of September 1939.The period following Poland's defeat became known as the Phoney War, characterized by limited military operations in Western Europe.This period of relative inaction would last until May 1940, when Germany would launch its offensive in Western Europe.In 1940, Nazi Germany began a rapid expansion across Europe.In April, German forces invaded Denmark and Norway.By May, the invasion extended to the Netherlands and Belgium.France fell to German forces in June, and an armistice was signed.The Battle of Britain began in July, as German air forces launched attacks on British targets.British forces successfully defended against the German air raids.Italy joined the war on Germany's side, expanding the Axis powers.These events marked a significant expansion of Axis control across Europe.In June 1941, Nazi Germany launched Operation Barbarossa, the largest military invasion in history.This massive invasion broke the non-aggression pact between Germany and the Soviet Union.German forces advanced along three main routes towards Moscow, with over three million troops.On December 7, 1941, Japan launched a surprise attack on the American naval base at Pearl Harbor.Japanese aircraft conducted a devastating attack on the Pacific Fleet.The attack led to the United States entering World War Two.Japan was already at war.Germany and Italy declared war on the United States on December 11th.These events transformed the war into a truly global conflict.In 1942 and 1943, three major battles marked the turning point of World War II.The Battle of Stalingrad was the bloodiest battle in history. German forces attempted to capture the strategic city, but were met with fierce Soviet resistance.The battle lasted six months, through the brutal Russian winter. The Soviet counter-offensive eventually surrounded and destroyed the German 6th Army.In North Africa, the Battle of El Alamein marked another crucial victory for the Allies.British forces under General Montgomery defeated Rommel's Afrika Korps, securing Egypt and the Suez Canal.The Battle of Midway in the Pacific Ocean proved to be a decisive naval engagement.American aircraft carriers destroyed four Japanese carriers, effectively ending Japan's naval superiority in the Pacific.By 1943, the Allies' industrial might had become overwhelming.Allied tank production more than doubled that of the Axis powers.In aircraft production, the Allies achieved an even greater advantage, producing more than three times as many planes.In June 1944, the Allies launched the D-Day invasion of Normandy, opening a crucial Western Front.Allied forces advanced from the West while the Soviet Red Army pushed from the East, both converging on Berlin.By May 1945, Berlin had fallen and Germany surrendered unconditionally.While Germany had surrendered, the war continued in the Pacific against Japan.On August 6th, 1945, the first atomic bomb was dropped on Hiroshima.Three days later, a second atomic bomb was dropped on Nagasaki.On September 2nd, 1945, Japan formally surrendered aboard the USS Missouri in Tokyo Bay.With Japan's surrender, World War Two officially came to an end. The conflict had lasted six years and resulted in over seventy million casualties.