“A history book written in the 20’s and 30’s without all the leftist bias?”
I read it some time ago, so I don’t remember about any leftist bias, but I found H.G. Wells, “Outline of History” quite interesting. I think I had an edition that had been edited and reissued around that time.
H.G. Wells was something of a leftist, but I’ve never read his O of H, just some of his fiction (which I found pretty contrived and trivial).