Political map of the Arctic & the Far North 9 April 1941 (Greenland Protectorate): Concerned about the possibility of a British/Canadian invasion of Greenland, the United States and the Greenlandic government quickly established diplomatic relations after the fall of Denmark (German invasion of Denmark (1940)). However when, in June 1940, the Germans conquered France (Battle of France), the US began moving to support the British war effort (Lend-Lease). The strategic importance of Greenland grew with this trans-Atlantic partnership and in 1941 the island agreed to US military protection (Greenland in World War II).