+5 Yes, Puerto Rico is widely considered a colony—or often described as the world’s oldest colony—due to its status as an unincorporated U.S. territory. While residents are U.S. citizens, they lack voting representation in Congress, cannot vote for president,

PR should get to decide if they want to join this clusterfuck or not. The bare minimum the US should do is allow PR to join if they want to, and guarantee military support if PR asks for it.
“Should” is neither here nor there.
I don’t know what you mean by military support. Are you saying if they are allowed to go independent? They won’t, there is zero chance they will be independent.