Deja vu all over again

Obama wants Puerto Rico to have a referendum on whether they want statehood or what. It seems we did this already, didn't we? Are we just going to continue to hold these referendums (referenda?) until the Puerto Ricans decide the matter in the "right" way, or to Obama's satisfaction?

I thought these matters were decided once and for all. Puerto Rico had a referendum. They decided on their current status. It's over. They don't vote for president. And they don't pay income tax. A trade-ff they are probably glad to make.

Are we going to allow Arizona--for instance--to decide whether they still want to be a State, or if not, what they would like to do? Perhaps they would like to be a province of Canada or Brazil. Why not? Oh, I forgot--the Civil War.