[hugh3]

2050 is only 39 years away... as far away as 1972.

While Puerto Rico may become a state (for reasons having nothing to do with "natural resources and cheap labour") I can't see anything else happening.

There's no strong demand for secession or splitting of states, quite apart from the major legal problems with either of those scenarios. And as for external territories Puerto Rico is the only sizeable one left. (What else? Guam?)