so recently i tried to do a single race state. no immigrants and at first it was okay.

but slowely i started to see cracks and
npc's never did this.

Than i ran into a population trap where i couldnt grow fast enough.

so i fixed the population gap by doubling down on population production and that worked.

than i ran into a job issue. where the jobs my race didnt like where suffering and this caused a loss of goods. supply and demand went crazy

and because trading in the game is bleh

My state stagnated.

i hope this post helps the developer .

as i would like to see 1 and 2 race states / even in npcs countries ....