Why is the War of Northern Aggression such a big deal in the South?
Anyone who has driven "off the beaten path" in any Southern state should be able to answer that question if they open their eyes and look around.
Only one Southern capital east of the Mississippi River was not captured by Federals during the war (Tallahassee, FL). Of the rest most of them were severly damaged or nearly completely destroyed. Most other major cities were heavily damaged. Many smaller towns were completely destroyed. Many individual farms were damaged or destroyed. A very high percentage of the entire white male population of the South was killed or wounded during the war, directly impacting families after the fighting had long ended. Cities and towns that do survive today took years or decades to rebuild and even then most never fully recovered. The politics of Reconstruction was so restrictive that the economy in the South languished until after the invention of Air Conditioning and even today still lags behind much the rest of the country. (Thank God for air conditioning!)
There was no damage to northern cities. A smaller percentage of the population was impacted by the death and wounds. For the north the war was fought "down there". For the south it was fought on our front steps. Even in relatively unimportant Florida I grew up just minutes away from a battlefield where over 3,000 people where killed or wounded in just a few hours of fighting. In Virginia you can't throw a rock without it landing on a place where there's a high chance someone died during fighting at some point in the war.
People look back on the history of WWII and clearly see that the overly oppressive terms laid down at the end of WWI directly led to the rise of the Nazi regime and resulted in WWII. The Reconstruction politics in the south were just as bad and directly led to the creation of the KKK, which then evolved into the racial organization we all know today.
Why do the New England Patriots have Minute Men as mascots? The Revolution was fought in their front yards. It impacted them directly in a very real way. Why do Southerners hold a high place of honor upon the sacrifices of Confederate soldiers? The Civil War was fought in our front yards. It impacted us directly in a very real way and continued to do so for 100 years or more.
It is easy to ignore a war fought thousands of miles away. But when that war destroys everything around you and keeps it that way for multiple generations is has a way of sticking with you. Why did America turn against Vietnam? Because television brought it into their homes on a daily basis and made it real. The Civil War was very "real" in the south in much the same way, only on a much broader scale, and stayed that way will past the middle of the 20th century.