User blog comment:KrusH HsurK/Earth, Capital of humanity, but lacking of its own capital?/@comment-4310096-20120508211244/@comment-4310096-20120508215501

This is true (forgot to mention it). The difference is, that the turian colonies were off-world colonies on other planets, like Taetrus or Invictus. Palaven itself probably has a unified governement seperate from the Hierarchy, much like Earth's nations aren't governed by the Systems Alliance, they´re just member states.