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In page Dual Alliance (1879):

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When Austria-Hungary and Germany formed an alliance in 1879, it was one of the more surprising alliances of its time.[citation needed] Though both shared the German language and a similar culture, Austria-Hungary and Germany were often driven apart, most notably during the recent Austro-Prussian War. Additionally, the Habsburg rulers believed that the promotion of nationalism, which was favoured by Germany, would destroy their multinational empire. However, their common distrust of Russia brought both empires together for a common cause.[1]