Ride-hailing app Lyft on Thursday announced its biggest expansion yet, amid turmoil at rival Uber. Lyft added more than 50 new cities in the U.S., including Topeka, Bismarck, Cedar Rapids, Des Moines, Columbus and Birmingham, the San Francisco-based company said in a blog post. That's on top of the 40 cities it added a month ago. In January, Lyft said...