The problem isn't declaring yourself to be a sovereign nation. You can make all the declarations you like. The problem is getting states and organizations (like the UN) to recognize you as such.
In theory, all you need is
Quote:
Originally Posted by Montevideo Convention
ARTICLE 1
The state as a person of international law should possess the following qualifications: a ) a permanent population; b ) a defined territory; c ) government; and d) capacity to enter into relations with the other states.
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But whether or not you can be an effective state, in practice and not just in the letter of international law, has a lot more to do with the behavior of all the other states.
On the bright side, you've got a whole super-team to enforce or defend your sovereignty. But then, maybe supers aren't uncommon in your setting, and all the other states have them, too -- which puts us right back where we started.
http://en.wikipedia.org/wiki/Micronation