Could Congress unilaterally change Puerto Rico's status?

Moderator Note

If this were in P&E or IMHO this would be a perfectly acceptable answer. However, since we are in FQ, let’s stick to established facts, and leave the political commentary and speculation out of it.

Let’s keep all answers appropriate for FQ, please.

As always in FQ, once the facts have been established, then we can engage in a bit of speculation. But we’re too early in the thread for that yet. Let’s get a factual answer first.