The term “middle power” is a convenient one that has come into general use as a means of avoiding the unreality of a simple division of states into “great” and “small”. While attempts to find a yardstick for the measurement of states have been fruitless, there can be some agreement on the categories. For practical purposes the great powers at the present time are those which hold permanent seats on the Security Council, just as during the war they were those which participated in the meetings of heads of government on high policial and military policy. There are clearly also a number of smaller states which, because of limited resources or small population, or both, are commonly ranked as small powers. In between lie a number of countries which make no claim to the title of great power, but have been shown to be capable of exerting a degree of strength and influence not found in the small powers. These are the middle powers. There is no agreed list because, while there is a fixed, if arbitrary, boundary between them and the great powers, there are, as it were, marginal powers which might be classified as “middle” or “small”. Probably, however, the following members of the United Nations would generally be recognized as middle powers: in Europe — Belgium, the Netherlands, and Poland; in the Americas — Argentina, Brazil, Canada, and Mexico; in the Pacific — Australia, and India.