This communication method- invented by samuel morse- was used widely in the in the mid-1800s and early-1900s and consisted of electrical pulses over long distances.

Here's what i found in History.com

Explanation:

Developed in the 1830s and 1840s by Samuel Morse (1791-1872) and other inventors, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations.

d. it gave farmers a way to organize for more political power