Which of the following was a critical factor in the urbanisation of America ?

Telephone

Human beings have used different methods long-distance communications of which the telegraph and the telephone were important. The telegraph was instrumental in the colonisation of the American West. During the early and mid-twentieth century, the American Telegraph and Telephone Company (AT&T) enjoyed a monopoly over U.S.A.’s telephone industry. In fact, the telephone became a critical factor in the urbanisation of America. Firms centralised their functioning at cityheadquarters and located their branch offices in smaller towns. Even today, the telephone is the most commonly used mode.