You were introduced some leading figures of the Civil War. From what you have learned, who do you think made the greatest positive contributions to the Civil War? Explain what they did and please be detailed with your opinion. PLS HELP ME I WILL GIVE BRIANLIST IF RIGHT OR IS REALLY GOODD

The Civil War was a time of great social and political upheaval. It was also a time of great technological change. Inventors and military men devised new types of weapons, such as the repeating rifle and the submarine, that forever changed the way that wars were fought. Even more important were the technologies that did not specifically have to do with the war, like the railroad and the telegraph. Innovations like these did not just change the way people fought wars–they also changed the way people lived.

after the roman empire, the catholic church began to unify by taking on many duties of a government.

the answer is a) high entry costs