The arguments have been said already, but you can't really coordinate with both nations with a common engime because they will start overlapping on several foreign issues (and I do recall the backstory being that North America is some sort of dystopia, or at least a regime with negative connotations), not to mention the idea of an officeholding ban regardless of how limited it is (and I praise those who worked to limit it) a petty one.
Pretty sure this is in reference to Atlasia. Nevertheless this is correct in that there needs to be some form of coordination between Atlasia's GM and South America's, lest we have overlapping realities.
Not sure why some of you are worried about whether or not South America has a constitution; it's purely an issue of internal affairs, not foreign policy, and Atlasia already maintains diplomatic relations with other nations without a constitution. Not to mention that a constitution was just overwhelmingly passed by the South American Parliament on a vote of 15-2.