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Archduke of Austria was assassinated and caused Austria to declare war, US stays politically neutral for now. -
H. H. Asquith of Britain declared war on the triple alliance, US declares their neutrality in the war. -
The Lusitania, a British cruise liner travelling from New York to Liverpool was torpedoed and sunk. The U-Boat ended up being the cause for 123 American deaths. -
Woodrow Wilson was elected president of the US. -
British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmerman to the German Ambassador in Mexico City. The telegram talked about Germany helping Mexico take back land in Texas, New Mexico, and Arizona. -
On April 6, 1917, the US Congress formally declared war against Germany and entered the conflict in Europe. -
The first 14,000 U.S. infantry troops landed in France at the port of Saint Nazaire. -
The US Congress passes the Sedition Act, a piece of legislation designed to protect America's participation in World War I. -
After more than four years of horrific fighting and the loss of millions of lives, the war ends at 11 am on the 11th month, of the 11th day. -
The Versailles Peace Treaty, signed on June 28, 1919, officially ended World War I. The treaty may have ended one war but it eventually started another.