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Germany invades Poland, Thus beginning World War II
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465,000 Soviets and 1,000 Soviet aircrafts cross the Soviet-Finnish border and bomb Helsinki.
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Germany begins using this tactic in Rotterdam and other Dutch cities.
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Germain Air attacks on Britain intensify as the British Royal Air Force starts bombing German targets at night.
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Germany, Italy, and Japan enter a 10 year alliance that comes to be know as the Axis. Hungary and Romania will join later.
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Germans invade Greece and Yugoslavia
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Germany invades the Soviet Russia, breaking the nonagression pact signed in 1939.
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360 Japanse planes attack Pearl Harbor killing more than 2,300 American soldiers, sailors, and civilians.
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After a vote in Congress and the House, President Roosevelt signs the declaration of war.
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Germany and Italy declare war on the United States, ending it's neutrality in the war in Europe.
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Congress establishes the Women's Auxiliary Army Corps under the direction of Oveta Culp Hobby
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Gasoling Rationing goes into effect for the Eastern United States
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The first 1,000-bomber attack on German industrial targets is carried out by Britain's Royal Air Force.
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At the University of Chicago's staff field, the first controlled, self-sustaining nuclear chain reaction is realized by a team of scientists working under the name of the Manhattan Engineering District
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In the United States, meat, fats, canned goods, and cheese are rationed.
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The battle of Kursk begins. The Soviets win eventually after a week of fighting. Both sides took heavy casualties.
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President Roosevelt repeals the U.S. Chinese Exclusion Acts of 1882 and 1902, thus allowing Chinese residents of the United States to be eligible for citizenship.
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An assassination attempt on Adolph Hitler by some of his generals are unsuccessful
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An American B-29 Bomber drops an atomic bomb on the industrial city of Hiroshima.
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General MacArthur accepts the formal, unconditional surrender of Japan in Tokyo Bay
