I've always thought that statehood for PR would be a bad idea...if they get dissatisfied with their present status they should become independent. If they became a state, it would be after a slim majority voted for it--what if twenty years later they all wanted independence? Would they be allowed to secede because they are Hispanic (the Confederate States were denied that option but they were mostly white Protestants--at least those who had any political voice were)?
If statehood becomes inevitable, they shouldn't be a 51st state but should be added to Vermont, so the Democrats don't get two more senators. If the Vermonters don't like it, accuse them of racism to shut them up.