What are three advantages of the telegraph?

A telegraph is the technology of sending electric signals through wires.  It revolutionized communication in the Nineteenth Century.  The first obvious change is that communication was made more efficient.  Before the telegraph, it could take weeks for a message to be sent from one part of the country to another. With the telegraph, messages could be sent instantly.  The telegraph altered the nature of commerce and politics.  Prior to the telegraph, business and politics were conducted on a regional basis.  Because messages could be delivered quicker, these entities expanded to become national and international entities.  The telegraph had the ability to make the world a smaller place.  The telegraph also had a tremendous impact on warfare because messages could be sent from the battlefield to command centers which ultimately improved war planning and strategy.  Even the President could receive instant messages from generals and other military personnel.