Answer:
All of the above
Explanation:
1. For the first time in the history of warfare, the telegraph helped field commanders to direct real-time battlefield operations and permitted senior military officials to coordinate strategy across large distances. These capabilities were key factors in the North's victory.
2. By transmitting information quickly over long distances, the telegraph facilitated the growth in the railroads, consolidated financial and commodity markets, and reduced information costs within and between firms.
3. The telegraph brought changes similar in many ways to the printing press: It allowed for an accumulation of knowledge and increased the availability of this knowledge; more people had access to more information.
