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Britain had an alliance with Belgium. Belgium was invaded by Germany in order to advance on France. Therefore, Britain declared war on Germany and joined the Allied Powers.

However, this was mainly an excuse to go to war. Really, Britain was opposed to Germany for many years since Germany started expanding itself as an overseas empire in 1885, which made Britain feel threatened. When World War I broke out, Britain jumped at the opportunity to fight Germany.

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12y ago

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