Which policies are available depends on the level of technological development stemming out from chosen ethics and political system.
Think twice before changing the policy, since radical changes can block certain actions for a long time.
Wartime economy
Name
Description
Passive
The economy is robust and isn’t influenced by war.
The system has to have Xenophobic, or Fanatically Xenophobic ethics.
Allowed
Can enslave any population.
Notes:Enslaved populations should inhabit planets that are oriented towards economic development.
They are best fitted for physical labor, so erecting research stations will not yield any spectacular discoveries.
In most cases you’re only able to enslave a population within you leading race.
Enslaving alien populations is only possible if your society is characterized by xenophobia.
Remember, that the tolerance for slavery is an important indicator.
Slavery can make your society very unhappy.
Purge
Forbidden
Purge is out of the question.
Can control only alien races.
The system has to have either Xenophobic, Fanatically Xenophobic, Collectivistic or Fanatically Collectivistic ethics.
Can exterminate every population.
The system has to have either Collectivistic or Fanatically Collectivistic ethics.
Notes:Purges can be useful if a given society is diverged, or belongs to a different race.
Limited
Allows using all the equipment, except the heaviest.
Destroys the infrastructure, but spares most civilians.
Full
Allows using full firepower, who cares about civilians.
Researching Primitive Races
Passive observation
Observation stations can perform passive research.
Unlimited
Observation stations can abduct primitive aliens and do all kinds of tests.
Alien worlds can be raided.
If they’re unable to fight back, they’re pretty much doomed anyway.
Enlightment of Primitives
Primitive races cannot be enlightened.
you could share technological achievements with primitive aliens.
Notes:Enlightening primitive races can provide additional profit in case of enslaving them.
Otherwise, there’s little gain here.
Migration
Populations cannot migrate freely.
Only main races
Only the main race can migrate freely.
Free
Every citizen of the empire is free to travel.
How useful the resettlement is going to be, depends on the specific objectives you want to achieve.
In case of democracy, you’re able to decide to give voting rights to all species.
This ensures that you have a way of directly meeting the candidates before the elections.
First contact protocol
Peaceful
Offensive actions can only be taken in response to attack by aliens.
Aggressive
Allows attacking neutral races.

It’s worth to rid your territory of them, so your map is more uniform.
Artificial intelligence
Robots cannot be constructed.
Every population of mechs has to be disassembled.
Robots can inhabit population slots on planets where you want them to work.
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