Per this post http://www.gravityhelp.com/forums/topic/display-us-states-and-canadian-provinces#post-67866, rather than use the Advanced Fields Address group, I created individual fields so I could use a custom list for a States / Provinces dropdown that i needed. Works great!
Now I'm wondering that if the user can only select a valid state/province, why am I asking him to also tell me what country he is from. By deduction I already know that. Plus I'm opening up the door to inconsistent data. The user could enter New York City, New York and then select Canada for the country. I think that my form needs to be a little more intuitive.
The reason that I don't delete the country field altogether is that it is useful on "List Entries" screen on the WP Back-end where I can quickly get snapshot of what country my entries are from.
Based on the value selected in the States / Provinces dropdown mentioned above, is there a way that I could set, via a hook, an Admin-only field (like a checkbox) that would indicate what country the user is from? Or even a hidden field?