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What did Denmark promise under the London Protocol of 1852?
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Under the terms of the London Protocol of 1852, which aimed to preserve the integrity of the Danish realm as a permanent element in the European balance of power, the Danish government made a specific commitment to Prussia regarding the administration of the duchies.12
In exchange for the German Confederation returning Schleswig and Holstein to Denmark, the Danish government promised not to tie Schleswig more closely to Denmark than it was tied to its sister duchy, Holstein.2