In 1950, Denmark agreed to allow the US to reestablish Thule Air Base in Greenland; it was greatly expanded between 1951 and 1953 as part of a unified NATO Cold War defense strategy. The local population of three nearby villages was moved more than 100 kilometres (62 mi) away in the winter. The United States tried to construct a subterranean network of secret nuclear missile launch sites in the Greenlandic ice cap, named Project Iceworm. It managed this project from Camp Century from 1960 to 1966 before abandoning it as unworkable.[62] The Danish government did not become aware of the program’s mission until 1997, when they discovered it while looking for records related to the crash of a nuclear-equipped B-52 bomber at Thule in 1968.[63]
On 21 June 2009, Greenland gained self-rule with provisions for assuming responsibility for self-government of judicial affairs, policing, and natural resources. Also, Greenlanders were recognized as a separate people under international law (One country, two systems).[69] Denmark maintains control of foreign affairs and defence matters. Denmark upholds the annual block grant of 3.2 billion Danish kroner, but as Greenland begins to collect revenues of its natural resources, the grant will gradually be diminished. This is generally considered to be a step toward eventual full independence from Denmark.[70] Greenlandic was declared the sole official language of Greenland at the historic ceremony