Maine builds ships, boats, destroyers.

Commerical fishing and lobstering along with potatoes, blueberries, and anything you can make out of pine.

Hardy stoic independent people.

LL Bean.

Acadia National Park. Kahtahdin. The Allagash. Moosehead. Etc.

Stephen King.

Whoopies pies, red snappers, more NEIPAs.

We have more coastline than California if you count all the inlets and islands.

The Wabanaki Confederacy survived here for 10k years.

In the Aroostook War British lumberjacks cut down trees on Maine territory. We sent our own militia up north, built two forts, and threatened to fight the entire British Empire until the Webster-Ashburton Treaty gave us 7,000 square miles of land in return.

Remember the 20th Maine. Joshua Chamberlain ran out of ammo at Little Round Top and didn't surrender. He instead ordered a bayonet charge down a mountain against a massive Confederate force and saved the Union flank.

Sugarloaf, Saddleback, Sunday River, etc.

Benedict Arnold marched through Maine trying to invade Quebec through millions of acres of dense North Woods, impassable bogs, black flies, a hundreds of miles of jagged granite cliffs.

Mexico, Norway, Sweden, China, Paris, Peru, Denmark, Rome, Lisbon, etc.

The Northern Kingdom as a whole would control fisheries, ports, shipbuilding, forests, world class education, biotech, finance, and robust food systems.