For instance, a board of California educators (appointed by Democrat Jerry Brown) convinced McGraw Hill to 1) add a note beside the bill of rights explaining that the Supreme Court has found gun control constitutional, 2) remove the word "massacre" when describing events in which white settlers were killed by Native Americans, 3) suggest suburban white flight was caused by racism and noting that some mortgages were unavailable to Blacks, 4) replace an excerpt on immigration written by a border patrol agent with one written by a Dominican immigrant, and 5) emphasize pollution & income inequality during the industrial revolution while promoting unions.
A similar board in Texas convinced the publisher to alter the same textbook by calling out Christianity's influence on the founding fathers, questioning the artistry of the Harlem Renaissance, and emphasizing free enterprise & hard work.
https://www.nytimes.com/interactive/...textbooks.html