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Officially, it was the German invasion of Belgium.

Britain and Belgium had been allies for around 70 years when the war began. Additionally, since France and Germany had been enemies in the past, their border was heavily fortified on both sides, but Belgium's borders were not as heavily fortified.

When the war began, Germany asked Belgium for permission to go through their territory; Belgium said no. So Germany did it anyway and conquered Belgium. When Germany launched their invasion, Britain honored their old alliance with Belgium and officially declared war.

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9y ago

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Q: What event made Britain enter world war 1?
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