Deletion of List of richest Americans in history to 1998

Comment: As the creator of this article, I obviously feel differently: I don't see how this list is different from List of billionaires (2004), List of billionaires (2006), and List of billionaires (2007), all of which are by necessity based only on one source (also Forbes), as are many, many other list articles in Wikipedia. In fact this list is better, because it is not released every year, and so we will not have the (largely redundant) year after year after year versions that we will have with the Sunday Times List articles and similar.  Imagine this article were titled simply List of richest Americans in history: I am sure even the nominator would agree this is a sufficiently notable topic; the problem with leaving off the "to 1998" is that it would invite |original research as misguided editors took it on themselves to "update" it year after year or day after day with their own calculations and without the benefit of reliable sources
Stance: keep
Cited policy: Wikipedia:No original research (WP:NOR)