The fall Motion_directional of Denmark in April 1940 left the Danish colony of Greenland an unoccupied territory of an occupied nation , under threat Warning of seizure by the United Kingdom or Canada .

To forestall this , the United States acted to guarantee Greenland 's position .

However , with the entrance of the United States into the war in December 1941 , Greenland became Becoming a combatant .

From 1941 until 1945 , the United States established Building numerous and extensive facilities for air and sea traffic in Greenland , as well as radio beacons , radio stations , weather stations , ports , depots , artillery posts , and search-and-rescue stations .

Economically , Greenland traded Exchange successfully with the United States , Canada , and Portugal , which , supplemented Supply by the cryolite exports Sending , caused Causation a reanimation and permanent realignment of the island 's economy .

While crossing Atlantic Canada , Carol became Becoming an extratropical cyclone , which dissipated Dispersal on September 9 southwest of Greenland .

The bomber crashed Destroying onto sea ice in North Star Bay , Greenland , causing Causation the conventional explosives aboard to detonate Attack and the nuclear payload to rupture Destroying and disperse Dispersal , which resulted in Causation radioactive contamination Bodily_harm .

In 1995 , a political scandal resulted in Causation Denmark after a report revealed Reveal_secret the government had given Giving tacit permission Preventing_or_letting for nuclear weapons to be located in Greenland , in contravention of Denmark 's 1957 nuclear-free zone policy .

It dissipated Dispersal over the cold waters east of Greenland .