Since the mid-19th century, Seattle and Tacoma have been business rivals. A focus of their fight: what to call Mt. Rainier. Tacomans wanted it renamed Tacoma or Tahoma, said to be the native names for the volcano, but the mountain’s “discoverer” named it for a friend in the Royal Navy. Rainier survives, but discussion has been rekindled after Alaska’s Mt. McKinley was renamed “Denali.”