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World War II began in September 1939 with Nazi Germany's invasion of Poland.Let's examine the key nations involved and their positions in Europe.Germany had positioned sixty divisions for the invasion, while Poland could only muster thirty-nine divisions for defense.The invasion began on September first, with German forces advancing from the west, north, and south.Britain and France declared war on Germany on September third, but provided no immediate military assistance to Poland.On September seventeenth, the Soviet Union invaded from the east with thirty-three divisions, catching Poland in a two-front war.Let's look at the timeline of Poland's swift defeat.After Warsaw's surrender on September twenty-eighth, Poland was divided between Nazi Germany and the Soviet Union.What followed was known as the Phoney War, a period of limited military operations in Western Europe.In April 1940, Nazi Germany began its rapid expansion westward.The first targets were Denmark and Norway, with Germany launching simultaneous invasions.In May, Germany launched its offensive against the Low Countries and France.By June, France had fallen. The country was divided into occupied France in the north and the collaborative Vichy regime in the south.In July, the Battle of Britain began as Germany launched intense air attacks against British cities and military installations.The Royal Air Force successfully defended against the German Luftwaffe's attacks, marking Hitler's first major defeat.In June 1941, Nazi Germany launched Operation Barbarossa, the largest military invasion in history.This invasion violated the Molotov-Ribbentrop non-aggression pact between Germany and the Soviet Union.The German forces were divided into three main army groups: North, Center, and South.On December 7, 1941, Japan launched a surprise attack on Pearl Harbor, Hawaii.This attack brought the United States into World War Two.By the end of 1941, the war had truly become global, with major powers from Europe, Asia, and North America involved.The harsh Russian winter severely impacted German operations, with temperatures dropping to minus forty degrees Celsius.In 1942 and 1943, three major battles marked decisive turning points in World War Two.The Battle of Stalingrad became the bloodiest battle in history. German forces attempted to capture the strategic city on the Volga River.Soviet forces launched a massive counter-offensive, encircling the German 6th Army in a devastating siege that lasted months.In North Africa, the Battle of El Alamein marked another crucial turning point. British forces under General Montgomery faced Rommel's Afrika Korps.The battle centered around control of vital supply lines. British victory secured the Suez Canal and Middle Eastern oil fields.The Battle of Midway in the Pacific Ocean proved decisive in stopping Japanese naval expansion.In a decisive naval battle, American forces sank four Japanese aircraft carriers, effectively ending Japan's naval dominance in the Pacific.The final Allied offensive began with the D-Day landings in Normandy on June 6, 1944.By May 1945, Allied forces had converged on Berlin from all directions. Hitler committed suicide, and Germany surrendered.While the war in Europe had ended, fighting continued in the Pacific theater.On August 6th and 9th, 1945, the United States dropped atomic bombs on Hiroshima and Nagasaki.Following these devastating attacks, Japan formally surrendered on September 2, 1945, officially ending World War Two.