The book examines US foreign policy during World War II. The author analyzes the course and content of negotiations between the USA and England, the USA and the USSR in 1941-1945, the American position at conferences of the leaders of the countries of the anti-Hitler coalition in Tehran, Yalta and Potsdam. It is shown what was the true, real contribution of the United States to the victory over the German-Italian-Japanese bloc and what was the content of American diplomacy of the "big strategy" during the war years.