Is American English in decline? Are regional dialects dying out? Is there a difference between men and women in how they adapt to linguistic variations?These questions, and more, about our language catapulted Robert MacNeil and William Cran—the authors (with Robert McCrum) of the language classic The Story of English—across the country in search of the answers. Do You Speak American? is the tale of their discoveries, which provocatively show how the standard for A...