Why did the London Conference of 1864 fail to settle the Schleswig-Holstein question?

The London Conference of 1864 failed to resolve the Schleswig-Holstein question primarily because it lacked control over the situation it aimed to regulate and was undermined by conflicting national interests and strategic delays.1

Key factors contributing to the failure included:

• Strategic Obstruction: Otto von Bismarck deliberately delayed the conference's opening to ensure Prussia and Austria could secure military control over Danish territory.1
• Conflicting Objectives: The participating powers could not agree on a solution. Denmark rejected proposals for a personal union, while Austria opposed Bismarck’s private efforts to ensure the duchies were militarily subordinated to Prussia.1
• Lack of Consensus: The conference was unable to find a viable alternative once the principle of Danish integrity was abandoned. The only remaining option—independence for the duchies under the Duke of Augustenburg—was ultimately rejected by the involved parties.1

The conference dispersed on June 25, 1864, without a conclusion, allowing the conflict to continue until the German-Danish War was settled through the Treaty of Vienna.1