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Germany sank a British Passenger ship, the Lusitania. killed 1,200 people including 128 Americans.
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U-boats were created in between 1912-1913
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Grenades were a very useful weapon in world war one because it was so effective at clearing out enemy.
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Air to the throne Franz Ferdinand was assassinated by Gavrilo Princip(19 years old). He was told to by the Black Hand.
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When Franz Ferdinand was killed, Austria blamed Serbia and declares war (The U.S. is neutral). As an effect of this Russia (who is aligned with Serbia) declares war on Austria Hungary
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Germany invades belgium this begins WWI
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Germany is the first country that used tanks in the war.
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U.S. decodes a message, for mexico saying that Mexico should invade America and if they do Germany would join Mexico with invading America
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Woodrow Wilson says that America is not going to join the war or take sides