THE DIVISION of Korea ranks high among the world's seemingly intractable problems, though the issue tends to simmer beneath the surface of world political consciousness most of the time, only erupting occasionally with sufficient violence to command close attention. Yet the circumstances of the division, and the fact that it is embedded in a set of antagonistic alliances involving all the major powers-at a geographical point where the borders or crucial interests of all converge-make it essential that we examine the issue very carefully. The starting point of this article is the belief that unification is desired by most Koreans, North and South, that it is highly desirable in the overall interests of peace and stability in Asia, and finally-though many would dispute this-that it is a realizable goal. The analysis that follows is based on study of the available public record and reflection over a period of years on the Korean question, supplemented by talks with responsible officials concerned with the unification issue in Seoul in February 1980 and in Pyongyang in May 1980. Korea in 1980 had a population of approximately 54 million-37 million living in the South and 17 million in the North. In the aftermath of the Korean War of 1950-53, about 10 million people were separated from members of their family by the military Demarcation Line, with no contact or communication possible, neither direct nor by mail or telephone. The severance was the more deeply felt as the Koreans were deeply homogeneous, with a continuous existence as a united people going back at least 1300 years and a history of outstanding cultural achievement prior to the imposition of Japanese colonial rule in 1910. But, despite the weight of this common cultural tradition, sharp differences have accrued under the circumstances of division. The South, fiercely capitalist, is tied by treaty to the United States (1953) and Japan (1965), while the North, which is distinctly non-capitalist and is commonly described as either socialist or communist, has treaties with both China and the Soviet Union, both dating from 1961. The South still has about 39,000 U.S. troops plus a U.S.-controlled nuclear weapons stock