To me, setting up a “USA” subforum anywhere feels perhaps redundant; the iNat forums already feel pretty USA, then Canada, centric. This is not a criticism, it is just how it is, and understandable given iNaturalist started in California.
Unlike for other places, there is not a need for a separate forum on the basis of language and/or geographical remoteness. In fact,
Exchanging local tips, meeting up, finding local experts, sharing local news, organising events, reporting issues, gathering for educational or conservation purposes.
sounds unwieldy across a national subforum for such a geographically large and diverse country as the USA.
I think about how parts of southern Florida have more in common with my part of Mexico than, say, Idaho. Parts of upstate New York are more akin to neighboring places in Canada than to Arizona. It’s just not one homogeneous country, which is why it is beautiful.
This is to say that many conservation issues, specialist knowledge areas, or event planning ought to consider inclusion of broader geographic areas, perhaps, to have the best chance of impact, reach the most people, find the best specialists.
(Fictionnal examples: #InatUK on Mastodon, Inaters of Ghana on FB, #NewYorkParkLovers on Instagram, INaturalist Seoul on Reddit..)
I am extremely confused why you needed to make these up if true ones exist. But even so, I note these examples are of much smaller places than USA.
If you choose to do so, I very much wish you well, I just think it sounds overlarge at the national level given the USA’s size, and so I might encourage “bitesize” first (town or city etc) as well as considering including nearby areas when appropriate and/or useful.
Good luck!