Ever since mankind stepped out of the solar system, their technology had entered a whole new period of rapid development. The land that mankind had subjugated was rapidly expanding within the galaxy.
Although there were all sorts of planets and galaxies in the universe, humans had been constrained within their own galaxy, unable to walk out. However, just one galaxy was big enough. The land that mankind had subjugated was already beyond everyone's expectations, and they were still continuing to expand.
However, with the development of their civilization and technology, humans hadn't integrated with the other races to become a unified entity but had instead been split up, and the entire galaxy was segregated.
