One problem that I have with so much historical writing is that many times historians didn't like all of what they discovered when researching, and so they choose not to share it all. A great example is the Thomas Jefferson-Sally Hemings controversy. All of the evidence looked at objectively for over 100 years shows that he fathered at least one of her children. And yet this country's Pulitzer Prize-winning historians did not like the idea of Jefferson having a relationship with a woman he held in slavery. So they ignored the evidence and dismissed the stories.
All writers have their own biases.
But as a writer of history, what you have to be willing to do is put aside those biases when the truth demands it. That's what too many so-called historians don't do. I felt how I did when I discovered that most black people had been excluded from history books. It just made me more determined to write about the people that had been excluded, so that kids today don't have those same gaps in their schooling that I had. I had heard about them when I was growing up, because a lot of black homes used to have pictures of the Buffalo Soldiers on their walls.