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A member of the serbian nationalist group called the black hand killed the archduke of austria hungary -
Austria gave Serbia one month to make up for their mistake and since they didn't, WW1 started -
On the 1st Germany declared war on Russia, on the 3rd Germany declared war on France, on the 4th Britain declared war on Germany
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Austria saw the connection between russia and serbia and declared war on russia -
To prove it's alliance to great britain, japan declared war on germany -
When austria heard that japan declared war on germany, they declared war on japan -
After sitting out of the war for too long, the USA decided enough blood had been shed and joined in -
After more submarine attacks on United States ships, we finally declared war on Austria Hungary -
Trying to not start another war, Woodrow Wilson outlawed the main causes of WW1 -
After 4 long years, the Great War finally ends