User blog comment:KrusH HsurK/Earth, Capital of humanity, but lacking of its own capital?/@comment-4310096-20120508211244/@comment-1221773-20120508215721

Not necessarily. Palaven could have been unified long before the Unification War, which was about the Hierarchy asserting dominance over turian colony worlds that had tried to secede.

And LeoJo, where did you hear that the UNAS was formed in 2092? I don't recall seeing a specific date for that in the lore.