The telegraph was a machine that revolutionized America in many ways.
It made it easier to communicate with others who are far away.
This allowed westward expansion to be more accessible and easier since you could communicate with people who were already west
It later made it possible to talk through morse code during world war one. The navajo code talkers are the people who used this to win the war(bbc.com).
The person who made the telegraph is Samuel Morse
It affected the South the more than the north because it helped the South win the Civil War,"The President of the United States telegraphed a colonel in the field during the Civil War Battle of Second Manassas (Bull Run) in 1862"(historynewsnetwork).