There should be stateless peoples in the game

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1:For example, if you are playing 1444 and you colonize a place, it is shown with a population of indigenous people living there instead of neutral people.

2: Representation of today's minorities in the game, such as Scottish Catalonian Kurdish Uyghur Maori

3:Divide colonization into 2 main types Settler colonization and Resource colonization. For example, in a united kingdom game we should be able to make Canada a settler colony and Egypt a resource colony.
Settler colonialism: Adds a certain base value and then the new value increases immigration by 50%
Resource colonization:Increases the resource output by 35

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4: Colonialist states should be incentivized by both the AI and the player to make their distant colonies vassals, with incentives such as higher tax revenues and fewer rebellions.

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5: The homeland of an ethnic group should be a dynamic value, not a static one. For example, if all the Scots migrate to California, California can become a Scottish homeland. Likewise, if the English migrate to Scotland, it can become an English homeland, but this will be a long process, if you don't do extreme radical behavior (if you do, depending on the year, on issues such as religion, nation, alliance, ideology), action will be taken against you by various states.