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British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmerman to the German Ambassador in Mexico City -
Defeat of France in War, Germany is unified as an Imperial federation of states -
Germany, Austria-Hungary (Hapsburg Empire) and Italy form the Triple Alliance -
The German submarine (U-boat) U-20 torpedoed and sank the Lusitania -
The 1916 United States presidential election was the 34th election in the history of the United States -
The United States formally declared war against Germany and entered the conflict in Europe. -
British advance on Souchez river continues. French carry crest near Hurtebise ("Dragon's Cave"). First fighting contingent of American troops lands in France. -
The Sedition Act of 1918 was enacted on May 16, 1918 to extend the Espionage Act of 1917 -
On this day in history, November 11th, 1918, the armistice was signed between the Axis and Allies ending the First World War -
The Versailles Peace Treaty, signed on June 28, 1919, officially ended World War I. Of note, on the same day, five-years earlier the Archduke Franz Ferdinand of Austria was assassinated at Sarajevo, Bosnia, starting the war.