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The treaty of Versailles is signed, ending WWI and forcing Germany to lose a lot in war reparations. -
Hitler was voted in as leader of Germany, being a member of the Nazi party. -
Held in Germany as a display of German strength, dubbed "Hitler's Olympics".
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Germany invades Poland, breaking the Treaty of Versailles and triggering England and France to declare war, starting WWII. -
Germany begins moving west, and starts to invade France.
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A pact of alliance signed between Germany, Italy, and Japan - designed to deter US from entering conflict -
Gas chambers, designed for quickly killing large numbers of prisoners, are implemented for the first time in the German concentration camp Auschwitz.
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Japan executes an attack on America's Pearl Harbor, a naval base in Hawaii, in order to discourage them from entering WWII. -
After Pearl Harbor, suspicion was widespread for anybody who was of Japanese descent, causing the US government to round up such people in internment camps.
(I couldn't find a date for the exact end of the camps.) -
Italy becomes the first of the Axis powers to surrender, leaving only Germany and Japan. -
The US and Japan fight over Iwo Jima, a Pacific island close to Japan from where the US could begin to launch attacks on Japan.
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With the defeat of the Nazis, those still alive in their concentration camps can be set free. -
Germany drops out of WWII, leaving only Japan in the conflict. -
The United States drops two atomic bombs on Japanese cities, first on Hiroshima, then Nagasaki.
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Japan is the last of the Axis powers to surrender, ending WWII.