| Summary: | With the German invasion of the Soviet Union and the Japanese taking all of Indochina, Roosevelt prepared the country for war and began to implement his grand strategy for victory. The president implemented his expansive vision of the Monroe Doctrine to allow naval escorts of lend-lease supplies across the North Atlantic, extended American aid to Russia, creating the Grand Alliance of the United States, Great Britain, and the Soviet Union, and joined with London in enumerating Western war aims through the adoption of the Atlantic Charter. At the same time, he extended the economic embargo against Japan to include oil, bringing the final break in relations with Tokyo. By the fall 1941, the U.S. Navy was engaged in the Battle of the Atlantic with German submarines. The Japanese attack on Pearl Harbor on December 7, 1941 brought the United States directly into World War II.
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