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Archduke Franz Ferdinand was shot and killed by a lone assassin. Believing the assassin to be a Serbian nationalist, the Austrians target their anger toward Serbia. the US watches what happens in Europe. -
The declaration is binding on all Dominions within the British Empire including Canada, Australia, New Zealand, India and South Africa. and the US declares that they are neutral -
A German submarine sank the great British liner Lusitania causing the death of more than 1,200 noncombatants, including 128 Americans. and the US remained neutral. -
Democratic U.S. President Woodrow Wilson narrowly defeated Republican Charles E. Hughes in the U.S. presidential election. -
British naval intelligence intercepted and decoded a telegram sent by German Foreign Minister Arthur Zimmermann to the German Ambassador in Mexico City. The telegram outlined a plan for an alliance between Germany and Mexico against the United States. -
The U.S. joined the Allied Powers, which included France, Great Britain, Russia, Canada, Australia, New Zealand, South Africa, and Italy. -
The first 14,000 U.S. infantry troops landed in France at the port of Saint Nazaire. -
The United States Congress passed the Sedition Act, a law that expanded the Espionage Act of 1917
The Sedition Act made it illegal to criticize the US government, military, or flag, or to support enemy countries. -
The Armistice of 11 November 1918 was signed, which ended World War I fighting between the Allies and Germany. This also ended the war for the United States -
The Treaty of Versailles was signed, officially ending World War I. The United States Senate rejected the Treaty of Versailles twice, in 1919 and 1920, and the U.S. did not join the League of Nations until after World War II.