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The war between France and Prussia lasted between 1870-1871
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The annexation of the provinces that were occupied by the Dual Monarchy .
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The German foreign policy became more bellicose.
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Russo-Japenese rivalry over Manchuria and Korea reached it's height with the Russo-Japanese War.
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Britain entered into an alliance with Russia that was already in alliance with France.
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Austria-Hungary decided to annex Bosnia and Herzegovina that was formally an integral part of the Ottoman Empire.
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Serbia was supported by the Tsarist government and the crisis persisted into 1909.
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Tangler Crisis and Agadir Crisis brought the European powers on the brink of war.
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The Italo-Turkish War that took place between 1911 to 1912 did not pose any major threat to peace in Europe.
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Serbia, Greece, Montengro, and Bulgaria formed the Balkan League, a military alliance against the Ottoman Empire.
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Germany and Austria-Hungary saw a premeditated war of aggression and conquest, a conflict that proved to be far removed from the swift and decisive venture that some had envisaged.
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A group of conspirators from the revolutionary movement called Mlada Bosna carried out the assassination of the Austro-Hungarian.
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Gavrilo Princip assassinates Franz Ferdinand.
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Austria declares war on Serbia.
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Ottoman Empire (Turkey) and Germany signed a secret treaty of alliance.
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Germany declares war on France.
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Germany invades Belguim, leading Britain to declare war on Germany.
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The French were actually the first to utilise them in conflict, when they attempted to use tear gas against the German army in August 1914.
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Austria-Hungary invades Russia.
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To aviod losing the territoryalready gained in France, the Germans began digging trenches.
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Pope Benedict XV suggested a temporary hiatus of the war for the celebration of Christmas. The warring countries refused to create any offical cease -fire, but on Christmas the soldiers in the trenches declared their own unoffical truce.
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Austria-Hungary presented an ultimatum to Serbia.
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The first tank, the British Mark I was designed in 1915. and first saw combat at the Somme in September 1916
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He was the first American pilot to shoot down an enemy plane during WWI.
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In World War I tanks first appeared at the Battle of Flers-Courcelette in September. It was the first time tanks had ever been used in a military conflict.
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Manfred Von Richthofen known as The Red Baron, he won eighty aerial victories before he was killed in action over france during WWI.
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British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmerman to the German Ambassador in Mexico City.
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The Russian people were fed up and demoralised by the huge number of Russian losses.
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Germany's resumption of submarine attacks on passanger and merchant ships and became the primary motivation behind Wilson's decision to lead the United States into World War I.
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Presidnt Woodrow Wilson cited Germany's violation of it's pledge to suspend unrestricted submarine warefare.
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The U-Boats never committed fully until well into 1917, caused the Allies very serious problems and scored incredible victories.