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Assassination of Archduke Franz Ferdinand
The leader was Gavrilo Princip, a member of the Black Hand secret society. The political reason for the assassination was to break off Austria-Hungary's South Slav provinces so they could be combined into a new country, Yugoslavia. This soon led to the outbreak of war in Europe at the end of July 1914. -
Trench Warfare, Poison Gas, and Machine Guns
Machine guns made their debut in WWI. During that war, they forced a change to trench warfare. In later wars, they helped change armies' tactics, moving the armies away from massed formations and into looser battle orders. Sadly, commanders in WWI kept trying them, even after they moved to trench warfare -
Sinking of the Lusitania
The sinking of the Cunard ocean liner RMS Lusitania occurred on Friday, 7 May 1915 during the First World War, as Germany waged submarine warfare against the United Kingdom which had implemented a naval blockade of Germany. -
Zimmerman Telegram
The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico. -
Russian Revolution
The Russian Revolution was a period of political and social revolution across the territory of the Russian Empire which started with the abolishment of monarchy and concluded with the establishment of the Soviet Union by the Bolsheviks and the end of the civil war. -
U.S. entry into WWI
The date of US entry into WW1 was April 6, 1917 when the nation was drawn into World War 1 on the side of the Allies. The United States of America entered the conflict, two and a half years after the war had begun on July 28, 1914, and declared war on Germany on April 6, 1917. -
Battle of Argonne Forest
The Meuse–Argonne offensive was a major part of the final Allied offensive of World War I that stretched along the entire Western Front. It was fought from September 26, 1918 until the Armistice of November 11, 1918, a total of 47 days -
Armistice
The World War One Armistice between the Allies and Germany was the agreement that ended the fighting on the Western Front in Europe.The WW1 Armistice went into effect on the eleventh hour of the eleventh day of the eleventh month on November 11, 1918. -
Woodrow Wilson’s Fourteen Points
The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I. The principles were outlined in a January 8, 1918, speech on war aims and peace terms to the United States Congress by President Woodrow Wilson. -
Treaty of Versailles
The most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers.
