From the end of World War II down to the dissolution of the Soviet Union, the primary objective of U.S. foreign policy has been to prevent the expansion of communism. Indeed, that objective was directly embodied in the so-called strategy of containment, a global approach to the pursuit of U.S. national security interests that was first adumbrated by George F. Kennan in 1947 and later became the guiding force in U.S. foreign policy. At first,...