Painter 2012, p. 29: "Although circumstances differed greatly in Greece, Turkey, and Iran, U.S. officials interpreted events in all three places as part of a Soviet plan to dominate the eastern Mediterranean and the Middle East. Mention of oil was deliberately deleted from Truman's March 12, 1947, address before Congress pledging resistance to communist expansion anywhere in the world; but guarding access to oil was an important part of the Truman Doctrine. The Truman Doctrine was named after Harry S. Truman. This doctrine stated that the United States would provide political, military and economic assistance to all democratic nations under threat from external or internal authoritarian forces."One draft, for example, of Truman's speech spoke of the "great natural resources" of the Middle East at stake (Kolko & Kolko 1972, p. 341).
Painter, David S. (2012). "Oil and the American Century". The Journal of American History. 99 (1): 24–39. doi:10.1093/jahist/jas073. Kolko, Joyce; Kolko, Gabriel (1972). The Limits of Power: The World and United States Foreign Policy, 1945–1954. New York: Harper & Row. ISBN 978-0-06-012447-2.