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.
Until the 18th century, the struggle between the Safavid version of Shia Islam and the Ottoman Turkish version of Sunni Islam had continued to remain an important dimension of the combative relationships between the two major empires.
