History should be studied in its entirety. Not just from the point of view of one race, color, creed, sexual orientation, etc. There should never be a point in time where there is no such thing as a history book. A book, once written and distributed - cannot be changed to reflect the current societal norms. History should be completely objective, since it is a series of facts and events, not just opinions and beliefs that can sway like the wind. Without history books, writers are free to revise Wikipedia references to suit the day. This is a revisionist view of history because something that happened is inconvenient, or potentially uncomfortable to read about by one group or another.