The data which has accumulated at the National Opinion Research Center over the past several years on the differential personality constellations of eight American white ethnic groups seemingly offer conclusive evidence that even when social class is held constant, immense differences of personalities have persisted among these groups. Among American ethnic groups there is a positive correlation between sympathy for racial integration and identification with and involvement in the ethnic community. There are four other major observations that can be made about the subject of diversity in the United States: (1) most Americans feel ambivalent about the fact of diversity and also about their own particular location in ethnic geography; (2) precisely because of this ambivalence about American cultural pluralism, there has been in the last quarter of a century relatively little in the way of serious research on the subject despite the fact that the later stages of the acculturation of the immigrant groups should have been considered a fascinating subject for social science; (3) on the whole, American social and cultural pluralism has worked rather well; and, (4) for a number of different reasons, there has been a dramatic increase in interest in America's cultural heterogeneity in recent years. (Author/JM)