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1. Assassination of Archduke Franz Ferdinand

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1. Assassination of Archduke Franz Ferdinand

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On June 28, 1914, the Heir to the Austro-Hungarian Empire, Archduke Franz Ferdinand, was assassinated by Gavrilo Princip in Bosnia and Herzegovina. His death was the beggining of the Domino Effect that led to WWI.

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2. Austria-Hungary Declares War on Serbia

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2. Austria-Hungary Declares War on Serbia

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On July 28, 1914, a month after Ferdinand's assassination, Austria-Hungary declared war on Serbia, and that started WWI. Ferdinand's murderer was a Serbian  nationalist, and that's why Austria-Hungary declared war on Serbia.

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Because the Russians didn't want to lose their influence over the Balkan region, they carried out a partial mobilization of troops on July 29, 1914, and they did this in support of Serbia.

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Germany mobilized troops as a reaction to Russian mobilization on July 30, 1914. In addition, Germany ordered Russia to demobilize, but Russia didn't do it and instead tried to negotiate with Germany. Germany wasn't willing to negotiate, so they declared war on Russia on August 1, 1914.

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On August 2, 1914, Germany attacked Luxembourg and occupied the country. The German government justified such attack and occupation as a neccesary way to support their armies in France.

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On August 3rd, 1914, Germany decided to declare war on France because they had declared war on Russia the day before so, they knew that if they were going to attack Russia they would have to fight with France too, and this because they were allies during WWI.

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Germany declared war on Belgium on August 4th, 1914, and the  particular reason was because Belgium would not let the Germans through their borders so they could attack France so, they declared war.

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Great Britain started moving their troops right after the Germans started declaring wars against France, Russia, Belgium, etc. The British seemed to want to put more pressure on the Germans and wanted to defend and work together with other countries to defeat the powerful Germans.

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9. Great Britain Declares War on Germany

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9. Great Britain Declares War on Germany

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Britain decided to declare war on Germany on August 4th, 1914. Britain was left dissatisfied with the decision that the Germans had made on declaring was against Belgium, since Belgium did not reply to the ultimatum which kept them neutral.

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10. A State of War is Declared at 11 p.m.

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10. A State of War is Declared at 11 p.m.

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After the U.S.A. declared their neutrality, Great Britain gave Austria-Hungary an ultimatum to stand down from hostilities, and they refuse, and this decision is what led them to declare the state of war at 11pm, and this is its importance.