It is not often I run into a word that I have never seen before. This one was a gift from my son's high school History teacher. The definition comes from (what else?) Wikipedia.
presentism (literary and historical analysis)
Presentism is a mode of historical analysis in which present-day ideas and perspectives are anachronistically introduced into depictions or interpretations of the past. Most modern historians seek to avoid presentism in their work because they believe it creates a distorted understanding of their subject matter.
The book my son has to write a report on, and the source of the comment on presentism: