But why did Denmark sign this agreement, and what rights does it confer the US? To examine that, one must first go back to World War II. World War II and Nazi invasion According to US Department of State records, available on its National Archives, the German Army invaded Denmark on April 9, 1940. Within days, the Danish government agreed to German occupation. On August 29, 1943, the German Army disarmed the Danish Army, imprisoned King Christian X, and took control over the country’s administrative functions. At that time, Greenland was a colony of Denmark, and had long been eyed...