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On June 28, 1914, Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, was assassinated in Sarajevo by Serbian nationalist Princip.

This event was an important point that led to the outbreak of World War I, and then the Austro-Hungarian declared war on Serbia. Germany, Russia, France, ad British followed suit, and the entire political opinion was a affected.

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On July 1, 1916, the battle of e somme began and ended in November. If tells the story of the British and France armies fighting the German on the Western Front.

The battle deeply affected European society, caused great destruction( the destruction of tanks), and also weakened the German army, which ultimately failed.

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On February to December 1916, the battle of verdun was breaks out. It is the battle between French and German.

This battle became a spirit, reflecting the people's spirit of resistance. However, this war made society cruel, because the largge number of casualties and the destructive horror of the fighting power made everything unpeaceful.

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The Russian Revolution of 1917 depicts the overthrow of Tsar Nicholas II, the rise of Bolsheviks, and the establishment of a communist government under the leadership of Vladimir Lenin.

The revolution inspired communist movements throughout Europe, led to Russia's withdrawal from WWI, changing the situation of the war and make everything peaceful

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On April 1917, American attacks on American ships by U.S submarines, then the United States declared war on Germany.

This event also marked the beginning of American's global influence as it played a important role in ordering.

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The treaty of Versailles, signed on June 28, 1919, ended WWI, imposed heavy reparations on Germany, and established the League of Nations.

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This treaty oppressed the Germans, which later led to the rise of Germany and WWI. It shows people's helplessness and anger towards the treaty.