Human

Humans, known scientifically as homo sapiens, are a spacefaring species native to Holy Terra. They first achieved interstellar travel after uncovering the Charon Warp Relay in the 23rd century, where they would rapidly expand as their own political entity until they were incorporated into the Old Republic.

Most humans in the 21st millennium live in the Imperium of Andarra, an authoritarian regime under the rule of the late-emperor Karl Franz; but there are countless billions of humans who live beyond the Imperium's borders.

Age of Terra
Humanity is considered as a relatively-ancient race by most species in the galaxy, though they were unable to progress as quickly as some races—like the Illyrians or Secorians—due to their turbulent history. However, their isolation from the rest of galactic affairs allowed them to develop their own distinct perspective on a wide variety of matters which greatly contributed their rise as the galaxy's foremost species.

The period before the discovery of the Charon Warp Relay is referred to as the Age of Terra. Not much is known about this period, but it is assumed by most Imperial scholars that humanity partook in a brutal conflict that resulted in the widespread destruction of Terra which rendered the planet uninhabitable for almost a century. When the warp relay was uncovered, humanity wasted no time in unlocking its secrets, and thus achieved interstellar travel soon after its discovery.

Golden Age of Technology
Mankind entered a technological, cultural, and societal golden age that lasted from M3 to M7 A.D. The race expanded quickly to its neighbouring star systems, colonising planet after planet. Eventually, humanity made first contact with the Secorians at New Shanxi, though they did fight against one another over a minor dispute regarding the activation of the system's local warp relay. As part of the Treaty of New Shanxi, humanity was given association status in the Galactic Republic—a massive interstellar government that prided itself as an egalitarian society.