Final answer:
The capital of Schleswig-Holstein, a state in northern Germany, is Kiel.
Step-by-step explanation:
The capital of Schleswig-Holstein is Kiel. Schleswig-Holstein is the northernmost of the 16 German states, known in German as Bundesländer.
Following the efforts of Otto von Bismarck, Schleswig and Holstein were united under German control, and Kiel became a significant location in German politics due to its northern port and maritime significance. This consolidation of power was part of Bismarck's actions to strengthen the German state, especially against foreign dominance — notably French imperialism at the time.