Most Americans would agree that the English language varies throughout the country's different regions. To the British ear, however, American English is uniform throughout the United States. In 1920 H. L. Mencken argued that the British voice spanned two octaves while the American voice spanned only one octave. According to the author, the primary difference between American and British English is how vowels are pronounced. Beyond pronunciation, there are differences in word meanings such as â€œunderground-subwayâ€ and â€œlift-elevator.â€ The differences between British and American English demonstrate the existence of a truly â€œAmericanâ€ language.