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The Triple Alliance was an alliance between Germany, Austria-Hungary, and Italy.
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The Triple Entente was an alliance between France, Great Britain, and Russia.
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Archduke Ferdinand of Austria-Hungary was assassinated by Gavrillo Princip, who was a member of the Black Hand(a rebel group in Bosnia)
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In response to the Schlieffen Plan, Great Britain delcared war on Germany.
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The Lusitania, which carried civilians and goods between the United States and Britain, was destroyed by German U-Boats.
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Germany resumed attacking merchant ships and killing civilians.
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After the Sinking of the Lusitania and the Zimmerman Note, it was inevitable that America would declare war on Germany.
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The Zimmerman Note was a note intercepted by the British, which was written to Mexico declaring the start of unrestricted U-Boat warfare.
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This act required men from the ages of 21 to 30 to register to be in the war.
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The AEF arrived in Europe to help the Allies.
