When was 'To Kill a Mockingbird' banned?

It was banned because it had the "N" Word in it 48 times out of 281 pages.

It was banned because of its racist implications toward the government. Many people denied being racist, so this novel was the key to helping racism getting acknowledged. Also book reviewers said the information was wrong and that the court system she had wrote about was wrong, they believed the court system was fair.