Why is Bless Me, Ultima banned?

Why is the novel "Bless Me, Ultima" banned in some places? What could be the reasons behind this decision? Is it due to its portrayal of spirituality and traditional beliefs that clash with modern values? Or is it the portrayal of sensitive topics like death, illness, and violence that have led to its censorship? Could it be that the book challenges societal norms and traditional authority figures? Understanding the context and themes of the novel may help shed light on why it has been banned in certain regions.