Most are fiercely proud Americans. Their blood has been spilled along side their mainland brothers in Afganistan, Iraq, Vietnam, Korea, the Pacific, Europe.....
Same can be said for Filipinos (see their courageous service in WWII under MacArthur), Samoans, and other current and former Colonials who have served honorably in our armed forces. We should be honored to have such folks serving our country.
Nevertheless, Puerto Ricans (those born and raised on the island) are not CULTURALLY American. They speak Spanish as a first language, watch Univision or Telemundo, play dominoes instead of poker, and actually enjoy dancing. I could go on and on.
The Puerto Ricans from San Ignacio Prep that I went to college with did not consider themselves to be Americans/gringos. That's the way it is.