pronouncement by U.S. Pres. Harry S. Truman on March 12, 1947, declaring immediate economic and military aid to the governments of Greece, threatened by Communist insurrection, and Turkey, under pressure from Soviet expansion in the Mediterranean area. As the United States and the Soviet Union (Union of Soviet Socialist Republics) struggled to reach a balance of power during the Cold War that followed World War II, Great Britain announced that it could no longer afford to aid those Mediterranean countries, which the West feared were in danger of falling under Soviet influence. The U.S. Congress responded to a message from Truman by promptly appropriating $400,000,000 for this purpose.