As Archer said in "Demons," "This isn't about finding someone else to watch our backs!" An external threat doesn't create real unity; it just puts tensions on hold until the threat is dealt with, whereupon they usually erupt stronger than ever. It takes far more than that to create a real union. Indeed, that's one of the core questions of the book. The Federation grew out of a war, but it became something far more than just a defense pact. That didn't happen automatically.
^ This is good stuff.
Should we expect to have a cast of political leaders as well, bringing some proto-Articles