The ArgumentOver the years national styles have been invoked or denigrated in the writing of the history of science. This paper is an attempt to give the concept of national style a degree of precision and clarity enabling scholars to understand when and how it may be invoked and when and how its use would be dubious or even forbidden. The example of the United States of America is used because the history of the sciences in the United States was (...) often written loosely in terms supposedly conducive to national style analyses. We first discuss the problem of commonalities, factors widely present within all countries in the Western tradition, which, by definition, cannot be exclusive national attributes. Here the problem is to somehow determine whether the supposed national style attribute is a case of a significantly different degree of intensity than some presumed norm in the Western tradition.The principal thesis advanced is that pre-existing historiographic assumptions largely determine whether or not a scholar finds or does not find a national style. This is discussed in terms of some examples for the U.S. case. More particularly, a number of examples are discussed from the three principal genres or schools in current writing in the history of science: the knowledge-centered; the doing-science; and the context-oriented. Based on the analysis of the examples, an attempt is made to sketch an approach to a more rigorous use of the concept of national style. (shrink)