Why does USA want to acquire Greenland?

December 26 Recently USA new President Donald Trump has shown interest in buying Greenland from it’s present owner Denmark.  Trump said ownership and control of this island was an absolute necessity for the purposes of American National Security.   Meanwhile, Greenland Prime Minister announced that the nation was not for sale and will never be for sale. Rather Denmark has announced a significant increase in its defence spending for Greenland, aimed at strengthening its military presence in the region.   Greenland has...