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Germany and the USSR invade Poland from the east and west borders. The Germans use their blitzkrieg strategy to quickly overthrow the area.
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Britain and France declare war on Germany. They don't really do anything, though.
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German troops invade France. They still use the blitzkrieg strategy to overtake the land quickly.
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Italy joins forces with Germany. This was the beginning of the Tripartite Pact.
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American president passes FDR passes the lend-lease act. This allowed U.S. allies to borrow supplies (if they shipped them themselves) and they did not have to pay the U.S. back immediately.
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Germany invades the USSR. They called their plan by its code name "Barbarossa". This betrayed the German-Soviet Nonaggression Pact that Hitler and Stalin signed earlier.
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The German army had become exhausted by this point in time. The Soviets strike with a counter-attack, ceasing German advancement further into the Soviet Union.
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Japanese air fleets make a surprise attack on Pearl Harbor, a U.S. naval base in Hawaii. The attack was close to, but never fully reached, success.
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Like Japan, Hitler and Mussolini also declare war on the U.S. The U.S., then, reciprocates.
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From August 19th to the 25th, American troops fought German armies for Paris. The Germans finally surrendered the city.
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Hitler commits suicide at the end of April. He died of a gunshot wound and by swallowing a cyanide capsule
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Soviets took back German-controlled Berlin. This showed that the German Nazi troops were weakening.
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On August 6, 1945, the U.S. drops an new invention on Hiroshima -- the atomic bomb. Three days later, the U.S. drops a second on the city of Nagasaki.
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Japanese forces surrender the war, and since Italy surrendered in 1943, were the last force of the Axis powers. This closed the war.
