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Germany invades Poland, initiating World War II in Europe.
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Honoring their guarantee of Poland’s borders, Great Britain and France declare war on Germany.
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The Soviet Union invades Poland from the east.
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Warsaw surrenders on September 27. Germany and the Soviet Union divide Poland between them.
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Germany attacks western Europe—France, Belgium, Netherlands and the neutral Low Countries.
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Italy enters the war and it invades France.
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The air war known as the Battle of Britain ends in defeat for Nazi Germany.
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Germany, Italy, and Japan sign the Tripartite Pact.
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Slovakia, Hungary, and Romania join the Axis.
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Germany, Italy, Hungary, and Bulgaria invade Yugoslavia
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Nazi Germany and its Axis partners (except Bulgaria) invade the Soviet Union. Finland, joins the Axis just before the invasion.
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Japan bombs Pearl Harbor.
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The United States declares war on Japan, entering World War II.
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Nazi Germany and its Axis partners declare war on the United States.
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Germany and her Axis partners launch a new offensive in the Soviet Union.
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Soviet troops counterattack.
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The Fascist Grand Council deposes Benito Mussolini, enabling Italian marshall Pietro Badoglio to form a new government.
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The Germans occupy Hungary.
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British and US troops successfully land on the Normandy beaches of France, opening a “Second Front” against the Germans.
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The Soviets launch a massive offensive and destroy the German Army Group Center and drive towards central Poland.
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Anglo-American forces break out of the Normandy beachhead and race eastward towards Paris.
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Finland concludes an armistice with the Soviet Union, leaving the Axis partnership.
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The Hungarian fascist Arrow Cross movement carries out a coup d’état with German support to prevent the Hungarian government from pursuing negotiations for surrender to the Soviets.
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The Germans launch a final offensive in the west, known as the Battle of the Bulge, in an attempt to re-conquer Belgium and split the Allied forces along the German border.
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Most of France, Belgium and the south of Netherlands are freed.
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The Soviets launch their final offensive, encircling Berlin.
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Hitler commits suicide.
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Germany surrenders to the western Allies.
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Germany surrenders to the Soviets.
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The United States drops an atomic bomb on Hiroshima.
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The Soviet Union declares war on Japan and invades Manchuria.
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The United States drops an atomic bomb on Nagasaki.
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Having agreed in principle to unconditional surrender on August 14, 1945, Japan formally surrenders, ending World War II.