What influence did Mart twain have on the Western cannon???? PLEASE ANSWER!?

In Tom Sawyer, he wrote in the vernacular. He was among the first to portray *****'s as real in huckleberry Fin. For the first 80 years, he was banned by librarians for the bad grammar of Tom and Huck. In his second 80 years, he was banned by schools for using the word "******". ****** is the word that kept a slave, a slave.