As a teacher myself, I fully understand what you are speaking about. Thankfully, so far, I have not experienced any censoring of what I can teach during black history month. However, I know of the movements occuring in some states and the bills that Republican led legislatures are trying to pass to censor teachers on a wide range of issues. Also, the book banning that is occuring in some states.
Regrettably, the Republican Party has chosen to energize it's base with attacks on public education, using race and other issues as motivating factors. The misguided obsession with CRT being a part of this. Hopefully, all of this will pass soon but I worry that Republican leadership will continue to use this issue to divide us.