[quote=@Lucidnonsense]
Can there be multiple human governments? perhaps working together but I dont see humanity as being able to achieve perfect unity.

Also, can we have more information on the aliens? why did they attack human colonies?
[/quote]Depends on what do you man by that it's already a thing here.
The Federation seems like an interstellar equivalent of the EU rather than a strict one government system since nations like Chaptrap's Fomoria can exist in them.