The Kingdom of Thanagar is another human-based society. They were fortunate enough to gain space travel and develop some power before being discovered by the Kree. Now they are a client state of the Kree Empire, but independent enough to have their own associations with other starfarers. The Kree collect a tribute in nth metal, a material peculiar to giant star systems like that of Polaris. With their overwhelming resources, the Kree Empire could overwhelm the Thanagarians any time they chose, but they know the price would be high, and their current association gives them enough of what they need to make such a takeover pointless.
The Thanagarian government, on the other hand, makes frequent use of its Kree connections to lord it over other, lesser (in their opinion), races and have engaged in a long term slave trade in exotic aliens. As the lords of Thanagar grow more and more decadent, some of these aliens have risen in the Thanagarian hierarchy, including the current ambassador to Earth, Kanjar Ro. Some with more knowledge of outer space politics than others recognize Kanjar Ro as the former dictator of a planet circling Deneb who was deposed, along with the tyrants of the other Denebian planets, by the Justice League many years ago. Another of the Denebian tyrants, Hyathis, is becoming quite prominent in Thanagarian social circles. Apparently the tyrants were rescued by the Thanagarians and brought to Thanagar as slaves some years after the Justice League imprisoned them, and some are making their influence felt.
None of the Denebian tyrants were of human stock.