So then the 3 Puerto Ricans that they sent up to be on the jury may not have even been citizens — and that may explain their answers to some of the questions.
Puerto Ricans are US citizens—by birth.
The Florida Hwy Dept. also has very strict requirements to show citizenship when getting a license and registering to vote. Passports, birth certificates and naturalization papers are required. You can get a license if you are a legal alien but not the voter registration. At least that was true when I registered here in Orange County, so I trust/assume/hope that applies in other Florida counties.
A Puerto Rican is a citizen.