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What demand did Prussia and Austria make to Denmark in January 1864?
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In January 1864, Prussia and Austria demanded that Denmark rescind the constitution it had enacted in November 1863.1
This constitution, which integrated Schleswig more closely with Denmark, was viewed by the German powers as a violation of previous international agreements regarding the Schleswig-Holstein question. When Denmark refused to comply with this demand, the two powers initiated military action, leading to the invasion of Schleswig on February 1, 1864.12