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What happened is that France, and Britain had a 2 way treaty with each other. Britain had an alliance with Belgium. And Russia had a treaty with Serbia. Germany had a treaty with Austria - Hungary. Serbia and Austria had a border dispute so some Serbians assassinated Austria's leader. So Austria declared war with Serbia which got Russia involved. And France had a treaty with russia so when Germany declared war on everyone they invaded France. But they had to go through Belgium to get there. So when Germany went through Belgium Britain, it's Commonwealth, and it's empire declared war on Germany.

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13y ago

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