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The Assassination of Francis Ferdinand
Archduke Francis Ferdinand was assassinated by Gavrilo Princip on Vitus Day. -
The Ultimatum
Austria demanded Serbia to end all anti-Austrian activities and to let Austria officials handle the investigation of the assassination of Francis Ferdinand. -
Declaration of War
Austria-Hungary declared war on Serbia. -
The Western Front
German troops crossed the border into Belgium, causing the first battle in the war. -
The Lusitania Sinks
A German U-boat sunk the British Ocean Liner Lusitania with torpedoes. -
Italy Declares War
Italy declared war on Germany and Austria. -
Battle of Loos
German troops were attacked by British forces in Loos, Belgium. -
Zimmerman Note
U.S. president Woodrow Wilson found out that Germany sent a telegram to Mexico proposing that they make an alliance against the U.S. -
The U.S. Joins the War
The first 14,000 U.S. infantry troops landed in France to join the war. -
The Treaty of Versailles
The Treaty of Versailles was signed and the war ended.