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Assassination of Archduke Franz Ferdinand
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Austria-Hungary declares war on Serbia which starts the First World War
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Germany declares war on Russia
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Germany declares war on France
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The first British troops land in France.
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Great Britain and France declare war on Austria-Hungary.
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First contact since Battle of Waterloo
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German-British naval battle at Coronel, Chile
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Germany declared the waters about the British Isles a "war zone" in which submarines would destroy enemy vessels.
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The Armenian genocide began. The Turkish government arrested and executed several hundred Armenian intellectuals.
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Italy signs the Treaty of London, committing itself to enter World War I on the side of the Allies.
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The British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. 1,198 people were killed.
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British soldiers began an attack against a German trench line which was supposed to have been destroyed. 29,000 people were killed and many more wounded.
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HMHS Britannic sinks in the Aegean Sea after a mine explodes, killing 30 people
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The Battle of Rafa occurs near the Egyptian border with Palestine.
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German Foreign Secretary Arthur Zimmermann publicly admits the "Zimmermann Telegram" is genuine. Generates support for the US declaration of war on Germany in April.
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