If Sweden intends to form [[Scandinavia]], but Prussia or Austria has taken Schleswig from Denmark, it is useful to use the "free people" Casus belli on [[Schleswig]]. It doesn't cost as much infamy as acquire state and Denmark usually take it for itself.
== Denmark ==
Including [[Denmark]] to your Sphere of Influence is not hard. With Heart of Darkness, Prussia and Austria no longer hold cores on Danish Schleswig-Holstein before they have researched Nationalism and Imperialism. Because of this, the AI for Prussia and Austria will no longer attempt to take Schleswig-Holstein in the first few years of the game. This means that Scandinavia can be formed simply by sphering Denmark, without the need to fight a tough war with Prussia or Austria.