"Hello, hello, can you hear me?"

Telegraphs, Samuel Morse's invention already had made an impact throughout the U.S. before the Civil War. But during the war, President Lincoln used the telegraph in order to communicate with generals because there was such a lack of communication. Because Lincoln was the first president to use the telegraph for communication purposes, he was called the "Technological President". Not only did Lincoln used the telegraph, but the future coming presidents also did too. He would use the telegraph daily whether it was talking to generals or to his wife and in total, Lincoln had sent about 1,000 T-mails. To some extent, many historians believe that Lincoln's T-mail and use of the telegraph as president actually helped him win the Civil War. Even though telegraphs were stumped by the invention of telephones in the 20th century, telegraphs were considered the first efficient way to communicate, especially in long distances. 

This is a picture of the U.S Military Telegraph Operators in
July 1863 according to Wikipedia.