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Archduke Franz Ferdinand and his wife Sophie, Duchess of Hohenberg were shot while in their car by Serbian Assassin Gavrilo Princip. -
Russia tells Austria-Hungary not to invade Serbia or they will be invaded.
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Austria-Hungary declares war on Serbia -
Formal declaration of war by Germany
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Due to the invasion of neutral Belgium, Britain gives Germany an ultimatum. Leave Belgium, or war. Germany doesn't leave. Britain declares war on Germany.
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