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Austria-Hungary declares war on Serbia, beginning the conflict.

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Austria-Hungary declares war on Serbia, beginning the conflict.

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July 28, 1914

Archduke Franz Ferdinand of Austria and his wife were assassinated by a Serbian nationalist in Sarajevo

Austria-Hungary declared war on Serbia, effectively beginning the First World War. That night, Austrian artillery divisions initiated a brief, ineffectual bombardment of Belgrade across the Danube River.

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The sinking of the passenger liner Lusitania by a German submarine

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The sinking of the passenger liner Lusitania by a German submarine

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On May 7, 1915, the German submarine (U-boat) U-20 torpedoed and sank the Lusitania, a swift-moving British cruise liner traveling from New York to Liverpool, England. Of the 1,959 men, women, and children on board, 1,195 perished, including 123 Americans

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the Battle of Verdun was the longest battle of World War I and one of the most costly in human history. It was fought from 21 February to 18 December 1916 between the German and French armies on the hills north of Verdun-sur-Meuse in northeastern France

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The Battle of the Somme, also known as the Somme Offensive, was a battle of the First World War fought by the armies of the British Empire and French Third Republic against the German Empire. It took place between 1 July and 18 November 1916 on both sides of the upper reaches of the River Somme in France

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The United States declares war on Germany

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The United States declares war on Germany

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The United States declared war on Germany on 6 April 1917, during World War I. The U.S. was an independent power and did not officially join the Allies. It closely cooperated with them militarily but acted alone in diplomacy

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In the spring of 1918, Germany launched what is known as the Spring Offensive, also known as the Ludendorff Offensive. It was a series of German attacks along the Western Front during the First World War, beginning on 21 March 1918, which marked the deepest advances by either side since 1914

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Germany signs the Armistice at Compiegne

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Germany signs the Armistice at Compiegne

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The armistice treaty between the Allies and Germany was signed in a railway carriage in Compiègne Forest on 11 November 1918, and marked the end of the First World War on the Western Front

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The Treaty of Versailles was a peace treaty between the nations of Japan, the United States, France, Austria-Hungary, Germany and Britain after World War I. The treaty was made in June 28 of 1919, but it did not take effect until 10 January 1920.