StarCraft II: The Story of Wings of Freedom

Humans split themselves into what they are now.

Let's not say that after the initial setting, the earth immigrated because it was uninhabitable. Now the story tells that the current empire was formed in the process of immigration to protect itself (that is, the empire provided armed protection for the planets within each empire, but the planets that did not sign subordinate contracts were no longer protected). So, the aborigines are either dead or have moved to other galaxies. It is normal for them to die of old age (for example, 1 people have three sons. After his death, the sons divided the inheritance, the eldest son took the property, the second son took the property and went out to find a place to live, and the younger son was kicked out to stand on his own feet. As a result, an empire was established. Hundreds of years later, the youngest son's empire was attacked by monsters, which is none of your business.