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The Archduke Franz Ferdinand of Austria and his wife Sophie, who were killed in Serbia by Gavrilo Princip.
The Austrians decided to present a unacceptable ultimátum for Serbia and then to declare war.

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The termas of the ultimátum of Austrians to Serbia were approved in July 19,kgs delivery was delayed until July 23 to avoid and immediate reaction for Russia.
After the crime,Austro-Hungary decided to present an ultimátum to Serbia with unacceptable terms.

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But the ultimatum was postponed in being received to July 23 due to the fact that the president of France and his premier went to visit Russia on July 15 until it was sent.
Russia warned that it would not allow Austria-Hungary to crush Serbia. This incident was the trigger that set off World War I, as Austria-Hungary declared war on Serbia on July 28, 1914. Germany and Russia also became involved in the conflict, and soon the major European powers were embroiled in a war.

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April 26,1915(The treaty of london of 1915)

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April 26,1915(The treaty of london of 1915)

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In april 26 of 1915 the countries do a secret agreement that was signed by Italy, Great Britain, France, and Russia.That was bringing to Italy in the World War 1 and was a crucial Impact in the conflict.

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August 27,1916(Italy declared war on Germany)

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August 27,1916(Italy declared war on Germany)

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The next three months saw three more Italian offensives on the Isonzo, none of them really profitable.

Italian-speaking Trentino was to remain under Italian sovereignty as well as the German-speaking areas of South Tyrol up to the main ridge of the Alps.

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Germany’s attacks on American ships and its attempts to meddle in U.S.-Mexican relations drew the U.S.

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The United States declared war on Germany

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America declare War to Austria-Hungary

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Germany and the Allies signed the Armistice of Compiègne, which represented the German surrender and the end of the First World War.

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June 28,1919(End of the WW1,Treaty of Versalles)

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June 28,1919(End of the WW1,Treaty of Versalles)

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Was a peace agreement signed at the end of World War I in France by more than 50 countries, which officially ended the state of war between the Germans of the Second Reich and the Allies of the Pact.