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How did King Christian IX become involved in the German-Danish War?

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King Christian IX became involved in the German-Danish War primarily due to the timing of his accession to the throne and the intense pressure of Danish nationalism.12

Christian IX ascended to the throne in November 1863, immediately following the death of King Frederick VII. At that time, Denmark was embroiled in a long-standing constitutional crisis regarding the status of the duchies of Schleswig-Holstein.12

Shortly after becoming king, Christian IX was compelled by strong popular sentiment in Denmark to sign the November constitution. This document, which had been ratified by the Council of the Realm, formally incorporated Schleswig into the Danish state. Because this action directly challenged German nationalist aspirations and the interests of the German Confederation, it made armed conflict with the German states inevitable. Consequently, the signing of this constitution by the new monarch served as the immediate catalyst for the war.12