Terran dominion

A Terran dominion or simply dominion is an alien client state of the Terran Federal Republic. The legal status is that of "allied states of the Republic under military and economic protection". The dominions are obliged to assist the Federation militarily, but in exchange they benefit from military protection, technological aid and economic investment. In Latin, dominions are known as foederati, referring back to the Roman term. Together with systems directly administered by the TFR, the dominions form Terran space.
There are currently seven dominions: the Somne Combine, the Perefi Republic, the Tormen Nation, the Seftet Kingdom, the Permezi Nation, the Dermkha State and the Komuggal Republic. Their combined population of the dominions is 57 billion, around a seventh of the galactic population. 
In the aftermath of the First Contact War, the Terran Republic's population and government adopted openly xenophobic stances. The first species to be encountered following the war were the Somne, which had discovered FTL only a few years prior. Two principal positions emerged, to wipe the species or to annex the territory. Ultimately, establishing a client state was chosen as a compromise. Despite initially being unsatisfactory to both sides, the success of the Somne dominion ultimately pushed Terran leadership to repeat the experiment. 
With the exception of the Tormen and Dermkha, all species organised in dominions were after a direct war between them and the Federation. Following Terran military victory, which was decisive in all cases but one, transitional puppet regimes are installed. These regimes receive massive economic and technological aid, almost exclusively in cicilian sectors. After some time, the Federal Commission may declare the state of transition over and install a new democratic system. Despite this, several Terran institutions, most prominently security agencies, operate in dominions, trampling any notion of sovereignty. These include but are not limited to: the Bureau, Federal Police and the BNS.