The Danish War of 1864 resulted in Prussia's and Austria's acquisition of Schleswig-Holstein.

The Danish War of 1864, also known as the Second Schleswig War, was a conflict between Denmark on one side and a coalition of Prussia and Austria on the other. The war arose from the question of the status of the duchies of Schleswig and Holstein, which were ruled by the Danish monarchy but had a significant German-speaking population.

Background:
- Schleswig and Holstein had a complex history and were part of the Danish monarchy, but they also had close cultural and historical ties to Germany.
- The issue of the duchies' status became a point of contention between Denmark and the German Confederation, a loose association of German states.
- In 1848, a rebellion known as the First Schleswig War erupted in the duchies, with the aim of incorporating them into a united Germany. However, the rebellion was suppressed, and a compromise known as the London Protocol was reached in 1852, which maintained the status quo but left the question of the duchies' future unresolved.

The War:
- Tensions continued to simmer, and in 1863, Denmark attempted to integrate Schleswig into the Danish state, contrary to the London Protocol.
- Prussia, under the leadership of Otto von Bismarck, saw an opportunity to further its ambitions of German unification and formed an alliance with Austria.
- In 1864, the Prussian and Austrian forces invaded Denmark, quickly overwhelming the Danish army and occupying the duchies.
- The war was brief but decisive, with the Danish forces unable to withstand the superior military might of the Prussian and Austrian armies.
- With their victory, Prussia and Austria gained control over the duchies of Schleswig and Holstein.

Aftermath:
- The Treaty of Vienna, signed in 1864, formalized the outcome of the war.
- According to the treaty, Schleswig was to be ruled jointly by Prussia and Austria, while Holstein would be administered solely by Austria.
- This arrangement did not last long, as tensions between Prussia and Austria escalated, leading to the Austro-Prussian War of 1866.
- As a result of their victory in the Austro-Prussian War, Prussia gained full control over both Schleswig and Holstein, effectively ending Austrian influence in the region.
- The Danish War of 1864 had significant consequences for the balance of power in Europe and laid the groundwork for Prussia's eventual unification of Germany in 1871.

In conclusion:
The Danish War of 1864 resulted in Prussia's and Austria's acquisition of Schleswig-Holstein, as outlined in the Treaty of Vienna. Denmark was unable to maintain control over the duchies, and the conflict marked a significant step in Prussia's path to German unification.