For some reason, these nations you choose seem unbalanced, and somewhat dumb.
United Earth:
If you choose to be an earther, you are choosing to be a dictator species that lies about peace and conquers, according to the description in game.
So this race, should not be allowed to have non-human immigration, and all immigration from those not of the same exact nationality should have a 75% chance of being deported, which means 100% of all aliens and 75% of all humans that aren't "United Earth".
Earther taxes and fees, should be far higher than other races, dominating the places they take over, taxing their people to starvation and death, with an increased civic cost of liberation.
Earthers mine ore by default instead of Regolith, and thats fine, thats a good feature for them. They should do so everywhere, harvesting Ore from asteroids or whatever habitat they start on.
League of Independent States:
The independents are treated like trash of humanity in the game, they can't pick an earth like planet, they can't have some of the other human technologies, and still have to pay high taxes. When you pay taxes, you pay taxes to the government that you're part of, so your taxes go to the League instead of United Earth. The League should stand for honor and peace, and stand for the people. As a League member, taxes should be lowered, 50% instead of 75%.
These guys should be able to build all the same structures as the humans, with the exception of that, they mine Regolith, instead of ore, and then compact that into usable ores or use it in other areas, being resourceful they get a little more ore for their work load. (E.G. for every ore a United Earth gets, a League miner would get the equivalent of 1.1 ore worth of Regolith).
Their government buildings should allow upgrades and certain actions that are the same as the earth counter parts, just with different names and styles, not to show dominance but to show peace. As an example, the consulate in UE has a planet crushing a civilian as its gold top. In League, it could be a dove with a leaf in its beak.
Immigration with this race is unhindered, all are welcome here and immigration is divided amongst all those that are part of your common wealth evenly. Unhappy people in your colony, should be allowed to leave the colony too, using the same immigration pads that allow them to come in, at the same rate as people come in. Which could mean you might have a line standing at your pads if people want to leave your colony which should indicate to you, that your approval rating is bad and you need to fix it.
Right now it kinda feels sorta like this nationality is treated like lesser weaker humans that aren't as smart or civilized, when its quite the opposite. They are more civilized and more intelligent for not being brutish dictators who care about only themselves.
Zolarg Empire:
I actually don't know anything about them.
Alpha Draconians:
I actually don't know anything about them, except they are ruthless dictator slave drivers. They should probably have the pure breed stat, and not allow any immigration at all except from their own race.
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I believe all races should be able to choose any planet however.
https://www.ape-apps.com/viewpage.php?p=17113
If you'd like to help fill in some data on these other two empires which I know nothing about yet, go ahead and comment. Please try to be detailed, as I have been with my posts.
i don't think that a good idea now because now we need to add building to zorlag and draconians not to buid wall in other to force them to chose one
later yes but now no