In people's consciousness, the Milky Way seems to have never formed a unified country. The current Milky Way is just a loose alliance composed of tens of thousands of planetary countries.
In this loose Galactic Alliance, countries with different systems coexist, including kingdoms, republics, principalities, etc. These countries maintain a superficial peace. According to historians' records, there has been no large-scale war within the Galactic Alliance for hundreds of years.
However, if you look forward a thousand years through the perspective of a historian, you will find that in that ancient era, the Milky Way was not what it is now. At that time, the Milky Way was ruled by a unified and powerful empire, which people called the Tyrath Empire.
Concept: science fiction works, magnificent cosmic epics