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Which of the following directly brought Great Britain into World War I? (1 point)
• Germany's invasion of neutral Belgium
• Germany declaring war on Russia
• Austria-Hungary declaring war on Serbia
the assassination of Archduke Franz Ferdinand

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Answered by GPT-5 mini AI
Germany's invasion of neutral Belgium.

Britain entered the war after Germany violated Belgian neutrality (Treaty of London, 1839) by invading Belgium on 4 August 1914; Britain declared war on Germany the same day.