system
Given the following post, respond as if you're commenting on Reddit:
human
[star wars] Why is the empire so human centric?

You see a ton of aliens in the star wars universe, but none of them are directly employed by the empire. Empire seems to be 100% homo sapien. Sure, they use aliens as bounty hunters and snitches, but Aliens aren't in uniform. 

What gives?
gpt
The in-universe explanation is that the Confederacy of Independent Systems counted many alien races among their ranks, which bred some animosity (ignoring the fact that there were plenty of humans in the CIS as well). The Empire played up existing tensions between humans and non-humans during the rise of the new order.