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Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated which caused the Austria treaty with Serbia and which caused the Austro Hungarian government declare war on Serbia. -
because of the diplomatic alliances that were in place before World War I -
Ammunitions were being carried on board the Lusitania. The Lusitania was a English boat flying the U.S. flag. -
Incumbent Democratic President Woodrow Wilson narrowly defeated former associate justice of the Supreme Court Charles Evans Hughes, the Republican candidate. The Democrats were in favor of going to war. -
The British intercept the Zimmerman Telegram where Germany tried to get Mexico to join the war. This will lead the U.S. to declare war on Germany. -
The United States declared war on the German Empire, joining France, Great Britain, Russia, Canada, Australia, New Zealand, South Africa and Italy. Since the men went to war, the women and kids were left home to work. -
The Austro-Hungarian Army forced 11 Italian divisions off the Mount Ortigara summit, regaining their important defensive position in Asiago, Italy. This was the 1st battle the U.S. fought in. -
was enacted on May 16, 1918 to extend the Espionage Act of 1917. -
An armistice was signed between the Germans and the Allies, ending the fighting. It was signed at 11am on the 11th day of the 11th month. -
The Versailles Peace Treaty, signed on June 28, 1919, officially ended World War I.