- Strategic Arctic positioning. It's central to Arctic geopolitics. While the Arctic ice melts, new shipping lanes are opening up, and countries are vying for control over these routes and untapped resources. The US already maintains a military presence at Thule Air Base, but integrating Greenland more formally would secure this position and reduce the risk of competing interests (think Russia and China making moves in the region - which they are very, very much doing).
- Resource potential. Greenland's rich in rare earth minerals and many others that are critical to modern tech and defense industries. These materials are currently dominated by Chinese markets. Greenland’s dev could diversify supply chains and reduce Western reliance on Chinese exports. This is SO insanely critical right now.
- You might not like this one, but: think geopolitical stability... Denmark’s grip on Greenland isn’t absolute. There’s been growing interest within Greenland towards greater autonomy, and while full independence is really complicated and economically (ultra) risky, stronger ties to North America would absolutely offer an appealing middle ground and protect the people of Greenland itself.
Ultimately if we ignore Greenland it feels like we're leaving a crucial puzzle piece out.