It appears Greenland will join the USA either voluntarily or unfortunately by force (which would mean one nato country attacks another, and could end the nato alliance) as a territory or statehood. This will happen within 1 year from today and their zip code will start with 19000 USPS. 68% chance of accuracy.
Current residents will receive immediate citizenship and other perks (part of the deal) which could include private property payments/payoffs, relocation assistance, and awarded benefits of mainland citizens.
US Passports will be issued. They may be dual citizens of Denmark and the U.S.
If statehood they will be able to vote, electoral votes possibly 2-5.
Vehicle/Passenger ferry service will begin 3 years from Greenland becoming a member of the states.
Ferry will run from Maine to Greenland funded by federal DOT.
Cruise ferries are hybrid ships blending cruise ship amenities (restaurants, entertainment) with Ro-Pax ferry (roll-on/roll-off) functionality, allowing passengers to bring vehicles while offering overnight stays with cabins, spas, and dining, functioning as both transportation and short cruises.. The distance is about 1000 miles.
Pros: Tourism, Ski resorts, massive infrastructure project (road, rail, highway), minerals, mining, rare earths, military. Greenland would have access to federal funds and a massive budget.
Two letter USPS ID "GN" All addresses will undergo E911 redistricting services. Counties are going to be incorporated, Sheriff's Dept for each county. Greenland State troopers (if statehood).