As per here The Smithsonian
http://www.smithsonianmag.com/smithso...

American Library Association List of most challenged books of 2014.the ALA notes that most books are challenged for more than one reason, books are most often challenged due to “sexually explicit” content (34 percent), offensive language (23 percent) and claims that they are unsuitable for their suggested age group (21 percent)“Attempts to remove books by authors of color and books with themes about issues concerning communities of color are disproportionately challenged and banned,” said the ALA in a release. “The lack of diverse books for young readers continues to fuel concern.”


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