Yes but I also think they should get to vote in general elections.
RIP Republicans if that were the case.
Normally we admit States as an ideologically contrasting pair (I.E. Alaska and Hawaii, though there roles at the time were reversed), so if it got to that point, Guam would most likely be admitted as well, and they are currently solidly Republican.
Yes, Puerto Rico, the U.S. Virgin Islands, Guam, and American Samoa could all be admitted as a group. Puerto Rico would be Likely D but not impossible for a Hispanic-friendly R to carry, the U.S. Virgin Islands are majority black, so Safe D, Guam is heavily military and military-industrial complex, so Likely R, and American Samoa is majority Mormon, so Safe R. However, Puerto Rico is about the size of CT and would get 5 CDs this decade, while the other 3 are all smaller than WY, so it would help Democrats in the electoral college and in the House (provided there's no concentrated local R strength in PR), but enhance the Republican tilt of the Senate.
///northern mariana islands