[tiredoflaundry]

I’ve been meaning to ask you, I do not remember the names, but many mistakes you point out are from the same publisher.
Is it because this publisher is that bad, or so few companies publish textbooks?

[LS]

Each publisher has several titles. Houghton-Mifflin, or Pearson, might each have as many as seven or eight history textbooks.

There are two levels of error. On "The Trouble With Textbooks," we mostly have sought to focus on bias and slanting of the material, as opposed to outright errors of fact. Because all the publishers, editors, and professors have a similar world view, though, not only do errors of interpretation creep in, but errors of fact creep in as well (i.e., the "Columbus killed the Indians" thing isn't even challenged by editors any more).