There are countless nations all around the Borealis Cluster, and maybe in some other galactic clusters. Most of them have extremely advanced technology, such as the Neo-Terran Intergalactic Hegemony.
With Humans spreading across the cosmos, they found many small alien Nations and Planets. To celebrate this, they created a Class System of Space Nations.
Planet-states are the smallest type of nation. Their territories consist of just an entire Planet, Planet-states mostly exist in Rocky Planets, Gas Giants or Ice Giants have 0.003% chance of having an Alien race dominating it and have a Government.
The technology of a Planet-state is commonly advanced.
Sector-states are nations that include many Systems inside a Galaxy, they are called “Sector-states” because sectors are a group of multiple Systems inside a Galaxy, an example of a S-type Nation is the Rylotharian Alliance, or the Thulcandran Federation, wich resides in most of the Orion Nebulae.
The technology of a Sector-state is commonly very advanced.
Galactic-states are very large nations wich it's territory is under control of more than 2 or just 1 Galaxy, an example of a Galactic-State is the The Ambrosia Alliance of United Systems.
The technology of a Galactic-state is commonly ultra advanced.
A good example of an Universe-state is the Neo-Terran Intergalactic Hegemony, their territories are composed of thousands of galaxies, and are the largest type of nation to exist so far.
The technology of a Universe-state is most likely more advanced than any other.