3. Summarizing How were messages sent by telegraph?

Answer: The system sent messages by using dots and dashes via an electric signal.

Explanation:

The telegraph operated off of wires that went all over the United States and abroad. The messages were sent via dots and dashes that the receiver had to decipher for the recipient of the messages. These messages were sent instantly via the electric signals in the wires. This was an easier way for people in that time to communicate since the mail could take months to receive.