© Pat Sullivan/AP Photo Roni Dean-Burren poses on the campus of the University oh Houston Monday, Oct. 5, 2015, in Houston. Dean-Burren is asking publisher McGraw-Hill Education to change the text in a geography book that refers to slaves…

A Texas mom shocked that her son’s textbook merely called African slaves “workers” is thrilled that publisher McGraw-Hill has promised revisions. But changing a single caption is hardly enough to combat what some educational experts call a wave of ideologi