Charles believed it was very important to assimilate the new Swedish territories of Scania, Blekinge, Halland, in southern Sweden; Bohuslän in western Sweden and Jämtland, in northern Sweden, and the island of Gotland.
Some assimilation policies included: the ban of all books written in Danish or Norwegian, thus breaking the promise made at the Treaty of Roskilde; the use of Swedish language in the conduct of sermons; and all new priests and teachers having to come from Sweden.

The king had seen bitter resentment from the Scanian peasants during the Scanian War and was particularly tough on that province.
The guerrilla Snapphane movement, in northern Scania, had attacked his soldiers and stolen his money.
They also had strong support from the local villages.
Charles remained sceptical about the Scanian inhabitants throughout his life.
He did not allow soldiers from Scania in his Scanian regiment: the 1,200 soldiers that were to be stationed there had to be recruited from more northern provinces.
He also advocated rough treatment of the inhabitants and the first Governor-General of Scania, his trusted aide Johan Gyllenstierna (governor-general 1679–1680), was notably brutal in his treatment of the locals.
The rule of Rutger von Ascheberg (governor-general 1680–1693), proved more lenient.

The assimilation was not as strongly implemented in the German dominions of Swedish Pomerania, Bremen-Verden, and the Baltic dominions (Estonia and Livonia).
In Germany, Charles found himself being opposed by the Estates there.
He was also bound by the law of the German emperor and the peace treaty.
In the Baltic, the power structure was completely different, with a German-descended nobility that used serfs, something that Charles abhorred and wanted to abolish but was unable to.
Finally, Kexholm and Ingria were sparsely populated and not of great interest.
Charles believed it was very important to assimilate the new Swedish territories of Scania, Blekinge, Halland, in southern Sweden; Bohuslän in western Sweden and Jämtland, in northern Sweden, and the island of Gotland. Some assimilation policies included: the ban of all books written in Danish or Norwegian, thus breaking the promise made at the Treaty of Roskilde; the use of Swedish language in the conduct of sermons; and all new priests and teachers having to come from Sweden.
The king had seen bitter resentment from the Scanian peasants during the Scanian War and was particularly tough on that province. The guerrilla Snapphane movement, in northern Scania, had attacked his soldiers and stolen his money. They also had strong support from the local villages. Charles remained sceptical about the Scanian inhabitants throughout his life. He did not allow soldiers from Scania in his Scanian regiment: the 1,200 soldiers that were to be stationed there had to be recruited from more northern provinces. He also advocated rough treatment of the inhabitants and the first Governor-General of Scania, his trusted aide Johan Gyllenstierna (governor-general 1679–1680), was notably brutal in his treatment of the locals. The rule of Rutger von Ascheberg (governor-general 1680–1693), proved more lenient.
The assimilation was not as strongly implemented in the German dominions of Swedish Pomerania, Bremen-Verden, and the Baltic dominions (Estonia and Livonia). In Germany, Charles found himself being opposed by the Estates there. He was also bound by the law of the German emperor and the peace treaty. In the Baltic, the power structure was completely different, with a German-descended nobility that used serfs, something that Charles abhorred and wanted to abolish but was unable to. Finally, Kexholm and Ingria were sparsely populated and not of great interest.
Charles XI of Sweden