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Assination of the Arcduke and his Wife Sophia
June 28 - Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo. -
Austria-Hungary declares war on Serbia
Austria-Hungary declares war on Serbia -
Germany declares war on Russia.
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Germany declares war on France.
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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Germany declares a "war zone" around Great Britain
