It actually sends some people to other cities, like "enslave", or its just that -1% growth population in the city....With too many people living in the city you get unrest. The Colony building helps deal with that unrest by sending people overseas to get the pressure off the city. It helps slow down population growth and increases order.
Thks for clearying this up guys, i guess i should have played a little longer bfore posting this, i kinda got with enthusiasm on the distinct possibility that this mod allowed the creation of settlements during a campaign :D
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