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Gavrilo Princip assassinated Archduke Franz Ferdinand of Austria. World war One starts.

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Italy received assurances in the treaty of London. Based of these assurances Italy declares war on Austria-Hungary.

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German pounded forts and trenches with artillery fire. battle of Verdun starts.

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The battle of Verdun ends. It was one of the longest wars of world war one.

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Germany's resumption of submarine attacks on passengers and merchant ships. This leads to The United States declaring war on Germany

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United States are victorious in the battle of Cantigny. It is the first independent American operation.

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Germany signs the armistice at Compiegne. This end World war One.