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Trench Warfare, Poison Gas, and Machine Guns
The enormous firepower of machine-guns, quick-firing artillery, and modern rifles forced the infantry to dig into the ground. The first shallow, temporary ditches gradually expanded into deeper trench systems. Most attacks against these trenches ended in failure. New weapons were introduced throughout the war to help break the deadlock. -
Assassination of Archduke Franz Ferdinand
The assassination of Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and Franz Ferdinand's wife Sophie, Duchess of Hohenberg, occurred on 28 June 1914 in Sarajevo when they were mortally wounded by Gavrilo Princip. -
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World War I
World War I, also known as the First World War, the Great War, the Seminal Catastrophe, and initially in North America as the European War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. -
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
Zimmerman Telegram 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 Armistice of 11 November 1918 was the armistice signed at Le Francport near Compiègne that ended fighting on land, sea and air in World War I between the Allies and their opponent, Germany. Previous armistices had been agreed with Bulgaria, the Ottoman Empire and the Austro-Hungarian Empire. -
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 Treaty of Versailles (French: Traité de Versailles) was 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.
