This was from a private publishing firm that produces supplementary learning material (everything from math workbooks, English worksheets, and this pseudo-history). It got semi-viral on facebook, which this photo is from, and the firm pulled it from their shelves. Also, unless you’re getting your kid a single subject supplement like math, these books are fucking massive. I have a fair suspicion that this publisher is basically a privatized extension of the school board so they can do fuck-all to update their materials, but don’t quote me on that. I grew up with textbooks older than myself!