St. Croix, St. Thomas and St. Jan, collectively known as the West Indian Islands, were sold to the the American government for $ 25.000.000 in 1916. Allready in 1913 the American government had pressured the Danish government for a handover for $ 100.000.000. This was refused, after pressure by the British and French governments. In 1915, during WWI, the American government put forth the demand again. This time the argument was that a possible German occupation of Denmark (did not happen) would secure bases for the German navy, specifically U-boats, in the Carribian theater. In return for this the American government promised to gurantee Danish sovereignty over Greenland. This despite the fact that an international court had allready recognized Danish sovereignty in a dispute between Norway and Denmark over control of the eastern part of Greenland. Of course, now Denmark was promised bilateral American recognition of the whole of Greenland. Win some, loose some - I guess.