I wonder how parties would develop if PR became a state. I doubt they'd be willing to shed the NPP and PDP so quickly in favor of the mainland parties... maybe we'd see regional party reps elected who'd caucus with the main parties in Congress?
They would be shredded fairly quickly. Most politicians in Puerto Rico declare a loyalty to mainland parties as well as their local ones. Regionalist political parties would not go down well and would be excluded in Washington.
They could just go the route of the Minnesota Farmer Labor Party.
The Farmer-Labor Party merged with the state Democratic Party, and the Democratic Party affiliate in Minnesota is now the Democratic-Farmer-Labor Party (or DFL). (Something similar happened in North Dakota, where the state Democratic Party affiliate is, amusingly, the Democratic-Nonpartisan League Party (or DNPL).)
Maybe the same would happen with the PPD, although the Democrats probably would prefer not to retain any of the name in order not to turn off former PNP supporters. PNP I agree would definitely dissolve.
