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Assassination of Archduke
Gavrilo Princip (member of Black Hand Serbian Nationalists) shoots Archduke Franz Ferdinand (heir to Austrian throne) and wife Sophie. -
Austria-Hungary declares war on Serbia
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Germany declares war on Russia
Germany was obligated by treaty to support Austria-Hungary -
Germany declares war on France
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Germany invades Belgium
Germany uses the Schlieffen Plan -
Trench warfare begins
two parallel systems of deep, rat-infested trenches cross France from the Belgian coast to the Swiss Alps. German soldiers occupied one set of trenches, American soldiers the other. -
German U-boat sinks British Lusitania
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German U-boat sinks British Arabic
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German U-boat sinks French Sussex
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President Wilson re-elected
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Zimmerman Note
The Zimmerman note was a telegram sent from the German foreign minister to the German ambassador of Mexico saying that when Germany took over the U.S., Mexico could have back lost territories. (N.M., Texas, Arizona) -
Kaiser says: U-boats will sink all ships
This meant the U.S. would have to go to war -
U.S. enters WWI
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Selective Service Act begins
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Treaty of Brest-Litovsk signed
Russia leaves the war -
Sergeant York kills 25 Germans
with help of several otheres, captures 132 prisoners as well -
Austria-Hungray surrenders
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Establishment of German Republic
The German Kaiser surrenders his throne. -
Armistice Signed: War is Over