This is a short, lively description of Operation Crossroads Africa, a privately financed forerunner of the Peace Corps. Mr. Isaacs accompanied 183 young people, mostly college students, in the summer of 1960 to Africa where they worked with Africans performing manual labor, clearing bush, building schoolhouses, and so on. Several hundred young people have participated in ""Crossroads"", so far. The main purpose is not the actual work performed, however, as the author makes clear. It is the change in attitudes that accompanies the transition of the world to a situation in which the white man is no longer master and the African no longer the colonial. Hence his title, Emergent Americans. If the book has a fault, it is that the author has dealt a little too heavily with abstract attitudes and not enough with actual incidents. But it is a minor fault, if it is a fault at all, and the book as a whole is enlightening and readable.