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  United States formally abolishes slavery.
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  Heir to the throne of Austria assassinated by Serbians
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  British and German troops emerge from their trenches to celebrate Christmas together.
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  Torpedoed by Germany. This tainted public opinion of Germany.
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  Treaty signed by Germany that ended World War 1
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  Year of runaway inflation
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  Began with the American stock market crash
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  Begins with Nazi invasion of Poland.
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  Japan attacks the U.S.
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  Surrender to the allies ending World War 2.
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  Founded after WWII in replacement of the league of nations.