Asklemmy

Puerto Rico ≠ Puerto Ricans

Puerto Rico doesn't get to vote. So anyone who is a registered resident of Puerto Rico, regardless of birth location, does not get to vote in federal elections. Full stop.

Puerto Ricans are US citizens with all the rights and privileges that go with that. They can vote in federal elections as long as they are not a registered resident of Puerto Rico. So if someone is born in Puerto Rico, moves to Florida and declares that their place of residence, then moves to Paris, France. They can vote via absentee ballot.

TL;DR: Puerto Ricans, yes. Puerto Rico, no.

Immigrants who have left the USA vote in the last state they were registered in.

DC gets 3 electoral votes. PR gets none. But, Puerto Ricans are Americans, and can move to any state they like and register to vote there. But they do have to establish residency in that state. If they then leave the country and vote by mail, their votes would count in the state where they established residency.

So someone living in PR who moved to PA, established residency there, and then went home could request an absentee ballot, but I don't know how long they could live outside the state and still be registered there.

They would have to establish residency in one of the states before moving abroad.

Don’t forget that these restrictions also apply to the Americans living in Guam, American Samoa, and the US Virgin Islands, as they all have the same status as Puerto Rico. It’s interesting too because citizens of the 50 states can vote absentee from other countries, and American Astronauts have voted from space. That would make Puerto Rico, Guam, US Virgin Islands, and American Samoa the only places in the universe an American can’t vote for President

You can vote from overseas in whatever location was your last permanent US residence.
People in DC get to vote for president because a special law was passed giving them electoral votes.

People in Puerto Rico have a US permeant residence that doesn't let them vote for president, so they can't legally vote from a different jurisdiction.
One of the proposals that's come up occasionally is to make a similar law for Puerto Rico as we did for DC, but there's never enough consensus on any plan to go forward, up until relatively recently.

You would have to live in a state (Hawaii included) long enough to be in resident status, then they can register to vote

If I, say, moved from PR to DC and registered as a voter there, I could vote as an overseas Amerikkkan. I think