Not an expert on US tribal law, but US-recognized tribes have signed treaties as 'nations' with the US federal government; membership and 'nationhood' is therefore more than just a 'belief', and has some level of legal legitimacy and status within the commonly agreed upon system of treaties underlying international travel
obviously not enough for it to count for too much, even domestically, but - main point - this isn't just a 'belief' from a legal perspective as is/would be in the case of this 'world passport'.
Not an expert on US tribal law, but US-recognized tribes have signed treaties as 'nations' with the US federal government; membership and 'nationhood' is therefore more than just a 'belief', and has some level of legal legitimacy and status within the commonly agreed upon system of treaties underlying international travel
obviously not enough for it to count for too much, even domestically, but - main point - this isn't just a 'belief' from a legal perspective as is/would be in the case of this 'world passport'.