Title: What is a historical bias? - Quora
Headings: 
What is a historical bias?
Content: Most of our “history” is a narrative creation, most of the time with an agenda (national identity, religious base or mid term objectives). The historical bias is the action to create and believe some narrative about the past, sometimes that’s made consciously and sometimes is not. As a history teacher i must say that the capital element here is to learn to understand the underlying tales, mostly because the truth in history is mostly impossible to get
Anthony Fabiano
Answered 3 years ago · Author has 231 answers and 362.7K answer views
Written History. Really short answer: history is written by the victors. Example: Hitler was completely evil, and the Allies were the good guys. True, mostly (except for Soviet Russia), but if Hitler won, then imagine what history would’ve said. Again, this is far more complex, and there would be more involved, but just remember that: History is written by the Victors.