"Everyone" should agree to this at least in theory but what the big cat fight has been about is the the lens filter being applied to specific text books. Unfortunately history is literally "old news" and who compiles and writes the books are essentially media editors. By inclusion and/or omission of specific facts the lens filter is applied with no little skill and text book writers can (and often) editorialize and sway the reader (learner) into drawing rather specific conclusions, whether religious, philosophical, or political. I'll give a common example of the Bible: Depending on what your denomination is your Bible may or may not include the 7 wisdom books with the Old Testament. Then you got the literal translation and the equivalency translation. And then, which of these translations? And, who is writing the footnotes? (Interpretation?) Same with history text books. This is why the Florida bill is being discussed, so parents in a given school district can give their input on the selection of course materials.