What are some of the most important and most westerly Civil War sites that you can visit today that served as major military arenas in the 1860s and 1870s?
Definitely Gettysburg. It was where the battle of ghettysburg took place and this was literally the turning point of the war. Also, lincoln gave his gettysburg address here so it explains a lot. Another place would be fort sumter. This was also another crucial battle which marked the beginning of the civil war.