Economic history, as a combination of two disciplines, has had a rather curious evolution. This is indicated both by looking at its checkered academic development in the United States, and by contrasting its evolution in the United States with that in England and elsewhere. Whereas in England and most European countries economic history is regarded as a separate discipline, with its own departments and professors, such an academic separation does not exist in the United States. Here, reflecting the dual nature of the subject, economic historians can be found in either history departments or in economics departments, and the nature of academic specialization often means they teach two distinct student bodies, with infrequent communication across disciplinary lines. Separatist tendencies have seemed more pronounced in the past two decades, when there was a marked change in the study of economic history in the United States, a change that has also affected other sub disciplines of history: quantification and model-building have spread into many areas of historical study. But in some measure this movement in economics reflects the recent tendency for economic historians to come from economics, rather than from history departments. Since the causes of the change seem, in part, peculiar to the United States, what I say about recent tendencies in the field may not fully reflect developments in other countries, although there seem to be similar trends emerging, albeit with some lags, in England and elsewhere in Europe.