[chimeracoder]

Nate Silver did an interesting analysis of this ability back in 2009 (before joining the New York Times): http://www.fivethirtyeight.com/2009/04/messing-with-texas.ht...

Puerto Rico already voted in favor of becoming a state in 2012. The only thing stopping it from happening now is a simple majority vote of Congress[0].

Personally, I think giving Puerto Rico, a territory that already must obey federal laws, the ability to vote on said federal laws is a much higher priority than splitting up the states that we already have.

...which is to say, of course, that I imagine that none of these will happen anytime soon.

[0] As best as I could tell, the threshold for statehood really is this low.