[capnq]

I don't think there's a way to look at another race's happiness trait within the game, but you can look it up for the AIs in the race's AI_General.txt file.

"Our" is anything you claim or control. "Enemy" is anybody you don't have a treaty with.

When you conquer a world, the population starts off really ticked at you, but settles down over time. It should improve faster if you have trooops on the ground and/or ships in orbit.

(Corrections for anything I've gotten wrong here welcomed.)

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Cap'n Q

The most merciful thing in the world, I think, is the inability of the
human mind to correlate all of its contents. We live on a placid
island of ignorance in the midst of black seas of infinity, and it was
not meant that we should go far. -- HP Lovecraft, "The Call of Cthulhu"