There are hundreds of challenges to books in schools and libraries in the United States every year. According to the American Library Association (ALA), there were at least 513 in 2008. But the total is far larger. 70 to 80 percent are never reported.
This map is drawn from cases documented by ALA and the Kids’ Right to Read Project, a collaboration of the National Coalition Against Censorship and the American Booksellers Foundation for Free Expression. Note that the cases mapped are only from the past three years (2007-2009).