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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 in the initial phase of the war.On September 1st, 1939, Nazi Germany launched its invasion of Poland.Two days later, on September 3rd, Britain and France declared war on Germany in response to the invasion.On September 17th, the Soviet Union invaded Poland from the east, creating a two-front war.Poland was subsequently divided between Nazi Germany and the Soviet Union.The period following Poland's defeat became known as the 'Phoney War', characterized by limited military operations in Western Europe.This initial phase set the stage for the expanding conflict that would become World War II.In 1940, Nazi Germany began a rapid expansion across Europe.In April, German forces launched simultaneous invasions of Denmark and Norway.By May, the Wehrmacht turned west, invading the Low Countries of Belgium and the Netherlands.In a stunning campaign lasting just six weeks, France fell to the German blitzkrieg in June.July marked the beginning of the Battle of Britain, as the Luftwaffe launched massive air raids against British targets.Meanwhile, Italy joined the war on Germany's side, beginning operations in North Africa.In June 1941, Nazi Germany launched Operation Barbarossa, the largest invasion in military history.This massive attack violated the Nazi-Soviet Non-Aggression Pact signed just two years earlier.On December 7, 1941, Japan launched a surprise attack on Pearl Harbor, Hawaii.The attack came in waves, with Japanese aircraft striking the US Pacific Fleet.The attack on Pearl Harbor brought the United States into World War Two.Within days, Germany and Italy declared war on the United States, transforming the conflict into a truly global war.By 1942, the war entered a crucial phase across three major fronts.The Battle of Stalingrad became one of the bloodiest battles in history, lasting from August 1942 to February 1943.The brutal winter and Soviet resistance proved devastating for German forces.In North Africa, the Battle of El Alamein marked a decisive victory for British forces under Montgomery against Rommel's Afrika Korps.British forces successfully pushed Axis forces out of Egypt, securing the vital Suez Canal.In the Pacific, the Battle of Midway in June 1942 decisively halted Japanese expansion.The US Navy destroyed four Japanese aircraft carriers, shifting the balance of power in the Pacific.These victories marked the beginning of Allied advances on all fronts, fundamentally changing the course of the war.In June 1944, the Allies launched the D-Day invasion of Normandy, opening a new Western Front.By May 1945, Allied forces had surrounded Berlin from both East and West.While Germany surrendered in May 1945, the war continued in the Pacific.On August 6th and 9th, 1945, atomic bombs were dropped on Hiroshima and Nagasaki.Japan formally surrendered on September 2nd, 1945, aboard the USS Missouri, marking the end of World War Two.