In discussing these three papers as they relate to history, it is an essential starting point to realize that the discipline of history is changing and has changed considerably in the last quarter century. History began as an account of the great deeds of our own ancestors, a record of the past that was essentially a backward extension of our own group personality. It long ago outgrew its concern with our tribal past and came to be concerned with the past of other peoples who share our Western culture. More recently, historians have become increasingly concerned with the past of other cultures as well. Some remnants of the older historical tradition are still around, but broadly speaking history now can be defined as the study of change in human society.

With this shifting focus inside the discipline itself, some of the barriers that used to surround history have also begun to disappear. One of these barriers was a distinction between history and pre-history, made according to the kind of evidence that each used. Historians worked with documentary evidence, leaving the pre-historians to worry with the kind of problem that could be solved only through the combined use of archaeology, oral tradition, linguistic evidence, and the like. In African history no such distinction is possible, and it is now generally abandoned. Documentary evidence about the history of Africa south of the Sahara begins about the ninth century, but it has to be used alongside non-documentary evidence. Documentary evidence, used by itself, only begins to tell the whole story when we come to the twentieth century, and even here it overlaps with the oral evidence of people still alive. African history is thus dominantly a history based on mixed data. The old line between history and pre-history is no longer useful, and the Journal of African History recognized this fact when, for convenience, it set a new division between history and pre-history at the beginning of the Iron Age — a date which will, of course, be somewhat different for different parts of Africa.