 Complete the following phrase:  By the end of 1941, the main lines of World War II had formed. Churchill referred to the Grand Alliance of the United Kingdom, the United States, and the Soviet Union, which together played the largest role in prosecuting the war. The alliance was largely one of convenience for each member: the U.K. realized that the Axis powers threatened not only its colonies in North Africa and Asia but also the homeland. The United States felt that the Japanese and German expansion should be contained, but ruled out force until Japans attack. The Soviet Union, having been betrayed by 