. . . the book by Donald Trump, Jr., is being marked as "questionable"?????

OMG!  The hypocrisy. 

Obviously Zinn had an agrenda with this garbage "lesson in history" for which there is absolutely no proof at all.  In fact, no one has any PROOF of anything which actually happened 400+ years ago in American history.  If you weren't there, you really don't know.  That's my motto.

https://thefederalist.com/2019/11/25/what-kids-in-portland-public-schools-learn-about-thanksgiving-war-crimes-and-racism/

"American Indians served in both World Wars, with deserved pride in their fighting abilities."  Not only their fighting ability, but their knowledge.  THIS fact is documented - - the Indians who fought in WWII assisted matters to a great degree because of their knowledge of and use of the Morse Code.  Few people actually knew the code at that particular time.  Today the only people who really know or understand it are the hobbyist ham radio operators.