Special search problem
I've done this sort of thing by using the Include / Exclude custom search (Search => Custom Searches => Include/Exclude Contacts in a Group/Tag)

Include a group that has all the contacts that you're looking at.  In your case you may need to create a smart group that has all the people in the country.  Then in the exclude list all the groups that they should be/could be assigned to.  Search.  You'll be left with all the people in the country to don't belong to any of the groups you listed in exclude.