Not that there isn't problematic stuff in them, they are books about pre-WWI 20th century Minnesota, written in the 40s and 50s. But it's a lot less than other kids' and youth books about American old timey stuff – way less minstrelry, Manifest Destiny, and racism against indigenous people than Little House On the Prairie and that kind of pioneer story.
(In the 10 Betsy-Tacy books and 3 supplemental Deep Valley books, here's what I can think of off the top of my head: someone performs in blackface at a talent show, settler violence is alluded to a few times and an older character romanticizes "Indian wars", there are characters who are racist against Syrians living in town but the racists are in the wrong and that's the plot of "Emily of Deep Valley", and sometimes the antiracists are paternalistic against other cultures.)
And if you'd like a softer version of the Anne and Gilbert slow burn, Betsy and Joe have got you over the course of 5 books. (No one smacks anyone with school supplies, though.)
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