Source: National Museum of American History.
The telegraph enabled the first instantaneous transmission of information
over vast distances. Its wide diffusion, by the 1870s and 1880s permitted
more efficient operations of businesses and railways. With the transoceanic
telegraph (1866 and afterwards) continents became linked and the telecommunication
industry was born. Several telecommunication giants of today (such as
American Telephones and Telegraphs; AT&T), started up as telegraph service