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Germany invades Poland, and WW2 officially began.
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Germany's invasion led Britain and France to declare war on Germany after a few days.
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Nazi Germany invades France and its allies. France surrenders, and much of Western Europe falls under Nazi control.
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The German Luftwaffe attempts to gain air superiority over Britain, but the Royal Air Force successfully defends the country.
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Japan attacks the U.S. naval base at Pearl Harbor in Hawaii.
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The following day after Japan's attack on Pearl Harbor, Britain and US declare war on Japan.
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Allied forces land on the beaches of Normandy, France, beginning the liberation of Western Europe from Nazi occupation.
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The United States drops the very first atomic bomb on the Japanese city of Hiroshima.
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Just after a couple days, US dropped another atomic bomb at Nagasaki of Japan.
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Japan officially surrenders to the Allied forces.
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After Japan's surrender, the WW2 officially ended.