https://en.wikipedia.org/wiki/Historical_revisionism

After the Second World War, the study and production of history in the U.S. was expanded by the G.I. Bill, which funding allowed “a new and more broadly-based generation of scholars” with perspectives and interpretations drawn from the feminist movement, the civil rights movement, and the American Indian Movement.[4] That expansion and deepening of the pool of historians voided the existence of a definitive and universally accepted history, therefore, the revisionist historian presents the national public with a history that has been corrected and augmented with new facts, evidence, and interpretations of the historical record.