Texas is the second largest buyer of school textbooks in the US and, unfortunately for the nation, the power to approve and reject textbooks is vested in the hands of a small State Board of Education, which is dominated by the Texas Taliban, that frightening brand of Texas politicos who are committed to making the law of (their) God the law of the land. The publishers frequently cave in to pressure from the Texas Taliban, and edit and revise their textbooks to appease them, since they can't afford to have their books rejected from the Texas market. The result is that the Texas Taliban affect the content of textbooks in dozens of other states.
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A nice thing about the Texas Taliban is that they actually publish their "criteria" for evaluating school textbooks. You can read them (and weep) at the web site of Mel and Norma Gabler, a kindly looking couple who have done more than anyone to try to undermine public education in Texas. They do catch the occasional error in school textbooks, but the errors they want to add (about law, about history, about science, about economics) are just breathtaking.
Remember, this isn't just a Texas issue, since the textbooks selected by the Texas State Board of Education are likely to end up in the classrooms of children from Michigan to Florida to Oregon.