Mr. Tannenbaum undoubtedly knows his subject in its entirety as well as any man alive; he has lived in, studied, and travelled the length and breadth of Central and South America for the past 40 years. Here he has assembled a brief--too brief to be more than a primer, perhaps--and solid study of the main points which he thinks are essential to a real understanding of Latin American culture, problems, and politics. The ten ""keys"" are entitled: The Land and the People; Race; Religion; Regionalism; The Hacienda; Education; Leadership; Politics; The United States and Latin America; and, Castro and Social Change. Each essay is concise, to-the-point, and--particularly the last two--most timely. Mr. Tannenbaum is very good at indicating the general sources of friction and misunderstandings between the United States and her southern neighbors; one wishes he had taken the time and space to try to tell us more specifically what must be done about them. Indeed, the only real fault to be found with this work is that it is half as long as it could and should be, and thus he scants some of the particulars which must make for any true grasp of the matters at hand.