Educator Debbie Reese has linked to a School Library Journal article on how librarians practice self-censorship to avoid controversy. She notes how this applies to Native subjects:
SLJ Column: "A Dirty Little Secret"The article also includes a brief mention of a writer who wrote a book about the Trail of Tears. Her publisher asked her to "...tone down her criticism of Andrew Jackson and his treatment of Native Americans..." I don't know the book at all, so can't comment on it one way or another. It is called The Trail of Tears: An American Tragedy, by Tracy Barrett. Rather than change what she wrote, Barrett went with another publisher.