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Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, were shot dead in Sarajevo by Gavrilo Princip,
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Austria-Hungary declares war on Serbia,
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This was a constitutional union of the Empire of Austria and the Apostolic Kingdom of Hungary
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Germany delcared war with russia
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Germany wrote an ultimatum to neutral Belgium asking permission to march through the country en route to Paris.
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The British declaration of war on Germany
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German invation in Belgium began
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Woodrow Wilson made Congress and made public the U.S. policy of neutrality
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French Fifth Army attacked St. Quentin.
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the Lusiitania torpedoed and sunk by a German U-boat, causing the deaths of 1,198 passengers and crew.
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Prime Minister Vasil Radoslavov of Bulgaria issues a statement announcing his country’s entrance into the First World War on the side of the Central Powers.
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The Germans attack again at Verdun
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This was a promise by the German Government to the United States in response to US demands relating to the conduct of the First World War.
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The Zimmermann Telegram (or Zimmermann Note) was a 1917 diplomatic proposal from the German Empire for Mexico to join an alliance with Germany in the event of the United States entering World War I against Germany
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The Sussex pledge only put off the inevitable American entry into the war
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3 american Ships were targeted by germans
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Wison outlined a case for war on April 2 but had the formal declaration on April 6, 1917.
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Greece declares war on the Central Powers,