Restrict membership

For various reasons my client isn't allowed to sell memberships to certain states. It has to do with a pending non-profit status.
Some states allow the membership without issue but about 30-35 don't. Until their applications are approved I need to restrict membership.
Can Conditional Content restrict something based on a U.S. state list? If I could prevent the registration based on a list of states that would be great and help quote a bit until they clear the issue.
So, ideally, I'd like ask for a state from the applicant and if they are on the embargo list, I would display a message saying we have temporarily embargoed registration.
Something like that.
Your thoughts?
Thanks,
Sevi

Peter,
Thanks for your reply. I'm happy Regular Labs is still here and thriving.

So, I get surrounding something. Can Conditional Content also automatically figure out a state based on the geolocation feature and hide something? In other words, if I have a membership button and/or form would I be able to tell your component not to show it based on a state (list of states)?

Thanks,
Sevi