From the interior of Sardinia to central Germany and Ireland, there is a lot of land that is uncolonized and seemingly empty on the political view. They do, however, have pops with their own religions and cultures. Colonization and Settling are the two ways countries can take control of these lands.
A territory is colonized by moving one pop of any social class but slaves to it. This can be achieved either by pressing the colonization button in territory view. This can be done at any time, as long as the following conditions are met:
The territory from which the colonization is done must:
- be adjacent to the territory being colonized, or be within 2 sea tiles of the territory being colonized.
- have at least 10 pops.
- majority of the population must have state's culture and religion.
- the colonizing not belong to the slave social class.
- have at least one non-slave pop.
- not being used to colonize in the last year.
When the "colonize" button is pressed one non-slave pop moves to the colonized territory, and the territory is integrated into the colonizer's country.
Migratory Tribes have the ability to turn all pops (min 3, max 20) in a territory into migration units, for a base cost of -8 Stability (Certain laws and your level of centralization modify this number). These Light Infantry units can settle in any uncolonized location as long as they outnumber the existing pops. When settled, they always turn into Tribesmen. Like colonization, all pre-existing pops are kept with their culture, religion, and types.
Migration units do not require military access to cross borders, and enjoy reduced attrition. Settling also works with foreign land a tribe currently controls in a war.