Upon the dissolution of the Holy Roman Empire in 1806, the Free Imperial City of Hamburg was not incorporated into a larger administrative area while retaining special privileges ( mediatised ), but became a sovereign state with the official title of the Free and Hanseatic City of Hamburg.

Upon the dissolution of the Holy Roman Empire in 1806 and the formation of the Concert of Europe after the Napoleonic Wars, the Romantic writer Constantin Frantz during the Vormärz era developed the concept of a Central European federation overcoming the German dualism between Austria and Prussia.

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