In addition to political resistance, Greenland’s mineral riches and strategic position would come at a steep cost for the U.S.

Trump’s threat to annex an autonomous part of Denmark has plunged NATO into an unprecedented situation: An alliance based on collective defense now faces the prospect that one member might attack another.

The ice-covered island may be strategically important, but it's unclear that it could be a commercially viable source of minerals and oil in the near future

Veteran diplomat tells CBS News Denmark "ready to cooperate" on Greenland, and he expects U.S. to abandon "anachronistic approach of colonialism" post-Trump.

In Greenland, you can get to pretty much anywhere in a matter of minutes," says local resident Alex Amasa Olsen.

Trump doesn’t need to annex Greenland to achieve his goals. But after Venezuela, he revived his threats to seize it, possibly via military force.

Greenland is 836,000 square miles of largely frozen ground northeast of Canada. So why does the White House say it "should be part of the United States"?

U.S. President Donald Trump has ramped up talk about bringing Greenland, a Danish territory, under Washington's control. Both Denmark and the U.S. are members of the NATO military alliance. Experts told CNBC that a U.