Half the history books look like political rants

I am Christmas shopping at Gibson's bookstore in Concord NH.  They have been in business a long time, and now occupy a fine big new building right on Main St.  Good stock.  Lots of books.  I am browsing the history shelf.  It struck me that at least half the books called history had titles and dust jackets suggesting either a political rant or a strong lefty slant.  I wonder where the schools are going for textbooks these days.  No sign of Morison and Commager, the college level go to US history book when I went to college.   Or Bruce Catton.  Or Shelby Foote.  Or Winston Churchill.