The book "The American language. A preliminary study of the development of the English language in the United States" by the author Henry Louis Mencken is a unique work devoted to the study of the evolution of the English language in the United States. In this book, the author examines the influence of various sociocultural factors on the formation of language style and vocabulary in American English. Henry Louis Mencken offers readers a deep dive into the world of linguistic features and historical contexts that shaped the speech culture different for each region of the United States. This book is not only a study of linguistic aspects, but also an interesting scientific work that opens to the reader a unique view of intercultural communications and the linguistic layer of American society.