A mistake constantly made by those who should know better is to judge people of the past by our standards rather than their own. The only way men or women can be judged is against the canvas of their own time.
If you write a book set in the past about something that happened east of the Mississippi, it's a 'historical novel.' If you write about something that took place west of the Mississippi, it's a 'Western'- and somehow regarded as a lesser work. I write historical novels about the frontier.