United Empire of Man: The Alien Frontier (Practice Story)

It is the year 16,920. Mankind has expanded its reaches for 3 millennia, integrating star systems, worlds and moons under its banner. But comes a dark truth to it, humanity fought wars against aliens to conquer planets and get their rescources and technology. Humanity, with the help of alien technology and millenium worth of R&D, was able to acquire, produce and engineer dozens of tech like better Ion technology, Life Extension, extremely refined cybernetics and artificial organs and harnessing dark matter itself as a power source. It was a young race with massive potential

Humanity started off by colonizing their Solar System and at the year 10,000, they were able to reach Pluto. And on the year 12,000, humanity set beyond the stars to spread out their species in a massive Intergalactic human empire. And as of the current year in the human calendar, 100,000 worlds and a handful of alien species in a commonwealth were under its control and the human empire breaching outside of the Orion Arm and to colonize more planets, venturing forth into greater heights of what humanity can be

And on the year 14,999, humanity made contact with not one, not two, and not three, but 7 alien empires of equal or greater than humanity. This gave humanity a great "Xeno Scare" which prompted a millenia worth of R&D to make up for their small size with a massive technological boost even if the young race was small compared to the massive empires of those unknown 7 Empires wont lag behind amongst those possible hostile threats

In the year 16,200 Humanity waged campaigns, battles and Skirmishes each of those 7 Empires in contested worlds to take and conquer and these civilizations are aware of humanity's small presence but at the same time impressive technological scale. Humanity is a small empire on a galactic scale but it can punch above its weight class with its massive tech to boost themselves internally and externally