Perhaps surprisingly, this is my first visit to Puerto Rico. It may be "epic" for me. I think this finishes my Tour de U.S.A.+ ... I've been to all 50 states, the Trust Territories of the Pacific (Guam, 1966, on the way to Vietnam), the U.S. Virgin Islands (swiped from Churchill in exchange for a few rusting Destroyers), and now Puerto Rico.
Do we have sovereignty over anybody else? (Iraq doesn't count!)