telegraph
because there just was that's why there was a rush of inventions in the late 1800s
alternating current
New production techniques that increased efficiency.
The railroad.
That was the alternate current which put to Edison electric monopoly in the late 1800s.
Because inventors focused on finding solutions to practical problems.
telephone
telephone
Radio communications was first introduced in the late 1800s with the telegram service. Several antques from that era sell well at www.ebay.com and also, www.amazon.com for more information.
The inventions of the late 1800s, such as the telephone, electricity, and the internal combustion engine, revolutionized communication, transportation, and daily life in the United States. These innovations facilitated rapid industrial growth, urbanization, and economic expansion, ultimately transforming the nation into a global industrial power. Additionally, they improved living standards and connected communities, fostering a sense of national identity and interdependence. Overall, this era of invention laid the groundwork for the modern technological landscape.
Well, the type writer and the telephone would be the first things that come to mind. The incandescent light bulb is another one. - I think this would only qualify as an revolution to the communications of America if you factored in it being used as a light signal on boats, and even that is arguable. While it is a major invention, I don't see it as a communication revolution.
They both contributed to the invention of the skyscraper, which really transformed cities.