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Bosnian Serb nationalist Gavrilo Princip assassinates Franz Ferdinand and his wife, Sophie the Duchess of Hohenburg. The Austrian Government suspects that Serbia is responsible.
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Austria-Hungary declares war on Serbia, World War I begins.
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When Australia joined the war, it caught most Australians by surprise even though there had been a climate for war for many years.
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The First Battle of Ypres was a battle of the First World War, fought on the Western Front around Ypres, in West Flanders, Belgium.
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The Gallipoli campaign was a military campaign in the First World War that took place on the Gallipoli peninsula,
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During the First World War, the Second Battle of Ypres was fought for control of the town of Ypres in western Belgium.
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The RMS Lusitania was a UK-registered ocean liner that was torpedoed by an Imperial German Navy U-boat during the First World War.
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The battle of Gallipoli ends with the British government authorized the evacuation to begin from Suvla Bay on December 7; the last troops left Helles on January 9, 1916.
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The Battle of Somme took place on both sides of the upper trenches of the Somme, a river in France, fought by the armies of the British Empire and the French Third Republic against the German Empire.
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The Zimmermann Telegram proposed a military alliance between Germany and Mexico if the United States entered World War I against Germany.
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On April 2, 1917, President Woodrow Wilson went before a joint session of Congress to request a declaration of war against Germany. The United States later declared war on German ally Austria-Hungary on December 7, 1917.
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The treaty was signed at German-controlled Brest-Litovsk, after two months of negotiations.
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The Treaty of 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.