However, some books commonly cited as among the most frequently challenged or banned in the US include:
* "The Catcher in the Rye" by J.D. Salinger: Often challenged for its language, sexual content, and portrayal of teenage rebellion.
* "To Kill a Mockingbird" by Harper Lee: Challenged for its racial themes and depictions of prejudice.
* "The Adventures of Huckleberry Finn" by Mark Twain: Challenged for its use of racial slurs and portrayal of slavery.
* "Beloved" by Toni Morrison: Challenged for its graphic depictions of slavery and violence.
* "And Tango Makes Three" by Justin Richardson and Peter Parnell: Challenged for its depiction of a same-sex penguin couple.
* "The Absolutely True Diary of a Part-Time Indian" by Sherman Alexie: Challenged for its language, portrayal of Native American culture, and its discussion of poverty.
It's important to note that the reasons for challenges and bans vary widely, and often stem from differing opinions on what is appropriate for different age groups or communities.
Instead of focusing on a singular "most banned" book, it's more valuable to understand the complex and ever-evolving landscape of book censorship in America.