I think that Groundspeak have created a very innovative and simple way to remember each state/ country /or part of a country/ throughout these souvenirs. First giving pride to the local geocacher community of that particular place and for sure to foreign geocachers that visits the area and helps them to remember those great achievements.
Definitely Puerto Rico deserves at least a nice souvenir, and hopefully we can have that one pretty soon.
milton_fmh