NASHVILLE, Tenn. — When the Lexus brand first launched in the U.S 28 years ago, it did so with just two sedans: the LS and the smaller ES. Over the years, Lexus, of course, added numerous vehicles to its portfolio — SUVs, sportier models and more coupes and sedans. With 2.18 million worldwide sales — one million in the U.S. alone — it is the most popular Lexus ever.