According to an article I found, "
So is Puerto Rico part of the U.S.?
"Technically, Puerto Rico isn't considered to be a
part of the U.S. (though certain laws treat it as if it were). Instead, it
belongs to the U.S. as an "unincorporated" territory. Unincorporated
territories of the U.S. are places where the country's constitution does not apply by default, except for in the case of certain "
fundamental rights" owed to all Americans. It is also possible for a territory to be "incorporated" as part of the country, but this status
rarely applies today."
http://www.polgeonow.com/2012/11/what-is-puerto-rico.html
And Wiki says PR is one of the Latin American countries, so this forum really is the best place for it even though it appears to be a sort of contradiction in terms, IMHO.
If you don't agree, there are two final sources you can check with: Siri or Professor Bender.