The American Language by H. L. Mencken
The American Language, first published in 1919, is H. L. Mencken's book about the English language as spoken in the United States. Mencken was inspired by "the argot of the colored waiters" in Washington, as well as one of his favorite authors, Mark Twain, and his experiences on the streets of Baltimore. In 1902, Mencken remarked on the "queer words which go into the making of 'United States.'" The book was preceded by several columns in The Evening Sun. Mencken eventually asked "Why doesn't some painstaking pundit attempt a grammar of the American language... English, that is, as spoken by the great masses of the plain people of this fair land?" It would appear that he answered his own question.