On Wednesday, Maine’s legislature passed a bill joining a compact to commit all of their electoral votes, regardless of who won in their individual state, to whichever candidate won the national popular vote.
Consequently, while all Puerto Rico residents pay federal taxes, many residents are not required to pay federal income taxes. Aside from income tax, U.S. federal taxes include customs taxes,[1] federal commodity taxes, and federal payroll taxes (Social Security, Medicare, and Unemployment taxes).
Just a note on the tax part:
https://en.wikipedia.org/wiki/Taxation_in_Puerto_Rico