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Archduke Franz Ferdinand was assassinated by Gavrillo Princip who was a member of the black hand who were a Serbian gang which resented the Austrian families for taking over -
Austria-Hungary declared war on Serbia because they were unhappy with serbia's response to the demands they set forth -
Russia joined the war and started mobilizing troops because they had a treaty with Serbia to help them if they ever went into war. -
Germany enters the war because they were tied to Austria-Hungary by treaty and saw Russia’s mobilization and saw it as an act of war against Austria Hungary -
France joined the war, they had a treaty with Russia and found themselves at war with Germany -
Great Britain joined the war because of a treaty with France although it was more of a moral obligation -
Japan declared war on Germany because of military agreement with Britain -
The Lusitania was torpedoed by a German U-Boat which caused the death of some Americans on the ship -
America entered the war after the sinking of the Lusitania and the Zimmerman Note -
Germany Signed the Armistice agreement with the Allies. WW1 left 9 million soldiers dead and 21 million wounded