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Archduke Franz Ferdinand and his wife, Sophie the Duchess of Hohenburg, are killed by Bosnian Serb nationalist Gavrilo Princip. (On Sunday, 28 June 1914, 10:00 am )

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Archduke Franz Ferdinand and his wife, Sophie the Duchess of Hohenburg, are killed by Bosnian Serb nationalist Gavrilo Princip. (On Sunday, 28 June 1914, 10:00 am )

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Austria-Hungary declares war on Serbia.  World War I begins. - (On July 28, 1914) 

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Austria-Hungary declares war on Serbia.  World War I begins. - (On July 28, 1914) 

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The United States of America declares neutrality as Europe erupts in war. (On August 4, 1914 )

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The United States of America declares neutrality as Europe erupts in war. (On August 4, 1914 )

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 The Germans conduct their first air-raid on the city of Paris, France. (On August 4,1914)

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 The Germans conduct their first air-raid on the city of Paris, France. (On August 4,1914)

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The Russians are defeated at the Battle of Tannenberg. On the eastern front, Germans shatter the Russian Second Army and take over 92,000 prisoners at the Battle of Tannenberg. (August 26–30, 1914) 

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The Russians are defeated at the Battle of Tannenberg. On the eastern front, Germans shatter the Russian Second Army and take over 92,000 prisoners at the Battle of Tannenberg. (August 26–30, 1914) 

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A German invasion of France is stopped in the First Battle of the Marne, causing the Schlieffen Plan to fail.(6 to 12 September 1914) 

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A German invasion of France is stopped in the First Battle of the Marne, causing the Schlieffen Plan to fail.(6 to 12 September 1914) 

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The Japanese attack and capture Tsingtao, China, which had been controlled by the Germans since 1898 (On september 1914)

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The Japanese attack and capture Tsingtao, China, which had been controlled by the Germans since 1898 (On september 1914)

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The First Battle of Ypres, a trench battle, takes place. Ypres was a Belgian city and communications hub, that was essential to both sides. The Germans give up their offensive by November 24 as winter and stormy weather set in.( October 19–November 22, 1914) 

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The First Battle of Ypres, a trench battle, takes place. Ypres was a Belgian city and communications hub, that was essential to both sides. The Germans give up their offensive by November 24 as winter and stormy weather set in.( October 19–November 22, 1914) 

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The Christmas truce was observed on the Western front.( December 24–25, 1914)

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In the Second Battle of Ypres, the Germans used a chlorine gas; more than 10,000 Allied troops are affected, over half of whom died(On april-22 - may-25-1915)

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In the Second Battle of Ypres, the Germans used a chlorine gas; more than 10,000 Allied troops are affected, over half of whom died(On april-22 - may-25-1915)

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The  passenger ship Lusitania is attacked by a German submarine and sinks in British waters. 1,198 civilians drown, including many women and children and 128 U.S. citizens.(On may -7-1915)

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The  passenger ship Lusitania is attacked by a German submarine and sinks in British waters. 1,198 civilians drown, including many women and children and 128 U.S. citizens.(On may -7-1915)

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The months long Battle of Verdun in France begins.(on February - December -19-1916)

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The months long Battle of Verdun in France begins.(on February - December -19-1916)

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The British use tanks on the battlefield for the first time. - (On 15 September 1916)  

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The British use tanks on the battlefield for the first time. - (On 15 September 1916)  

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The Americans learn of the Zimmerman telegram, in which the Germans bribed Mexico to attack the United States.(Jenuary- 1917)

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The Americans learn of the Zimmerman telegram, in which the Germans bribed Mexico to attack the United States.(Jenuary- 1917)

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Germany threatens submarine warfare against ships from neutral countries. (February 1, 1917)  

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Germany threatens submarine warfare against ships from neutral countries. (February 1, 1917)  

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American President Woodrow Wilson asks Congress to declare war against the Germans and their allies.  (April 2, 1917) 

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American President Woodrow Wilson asks Congress to declare war against the Germans and their allies.  (April 2, 1917) 

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The Germans smuggled Vladimir Lenin into Russia where he leads the Bolshevik Revolution. (April 16, 1917) 

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The Germans smuggled Vladimir Lenin into Russia where he leads the Bolshevik Revolution. (April 16, 1917) 

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On the first day of the draft, millions of American men register for service under the Selective Service Act . (On May 18, 1917)

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On the first day of the draft, millions of American men register for service under the Selective Service Act . (On May 18, 1917)

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Treaty of Brest-Litovsk is signed by Soviet Russia and Germany. Germany sets harsh terms and Russia is out of the war. (On March, 3, 1918)

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Treaty of Brest-Litovsk is signed by Soviet Russia and Germany. Germany sets harsh terms and Russia is out of the war. (On March, 3, 1918)

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French and American forces of the 3rd, 28th, 32nd, and 42nd Divisions go ‘over the top’ on their offensive at Aisne - Marne. (July 15-August 6, 1918) 

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French and American forces of the 3rd, 28th, 32nd, and 42nd Divisions go ‘over the top’ on their offensive at Aisne - Marne. (July 15-August 6, 1918) 

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The Treaty of Versailles is signed, ending the war and punishing Germany severely. (On June 28, 1919) 

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The Treaty of Versailles is signed, ending the war and punishing Germany severely. (On June 28, 1919) 