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In page German Empire:

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Unusually for a federation or a nation-state, the German states maintained limited autonomy over foreign affairs and continued to exchange ambassadors and other diplomats, both with each other and directly with foreign nations. Shortly after the Empire was proclaimed, Bismarck implemented a convention in which his sovereign would only exchange envoys with other German states as the King of Prussia, while envoys to foreign nations always received credentials from the monarch in his capacity as German Emperor. In this way, the Prussian foreign ministry was largely tasked with managing relations with the other German states while the Imperial foreign ministry managed Germany's external relations.[citation needed]