It made the people realize that it was not just a collection of individual states; it was one unified nation.
Total Warfare: its best example was Sherman's March to the Sea, where his troops destroyed railroads, bridges, warehouses, crops, telegraph lines, all forms of infrastructure. It prevented sending reinforcements and supplies to Lee's troops, starving them out, and it served to weaken the morale of the serving troops, making them fear for the safety of their families back home.
Jerusalem has been considered a holy city mostly by Jews, Christians, and Muslims--which is why it is one of the most contested and fought-over pieces of land in the world.
