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DiogenesLamp: "But no, it's not good that there was a "civil war" at all.
It also wasn't really a civil war.
The South was not trying to take over the Federal government.
They were just trying to make the Federal government leave them alone. "

Of all the Big Lies our Lost Causers tell, this is one of the biggest, a fact that DiogenesLamp himself will admit in brief moments of lucidity.
Consider the Confederacy's very rapid growth:

When South Carolinians declared secession in December 1860 they represented barely 1% of US total land and 2% of US population.
When Texans seceded in February 1861, the Confederacy had grown to 15% of total US land & population.
When North Carolinians seceded in May 1861 Confederates had grown to 20% of US territory and 28% of its population.
But it didn't stop there.
Confederates also claimed the Union states of Missouri and Kentucky, which would increase their territory to 23% and population to 36% of total USA.
But they wanted more.
Confederates also claimed Union territories of Oklahoma, New Mexico and West Virginia, increasing their totals to 29% of territory and 37% of the population.
And it didn't stop there.
Confederate armies also invaded Union Maryland, Pennsylvania, Ohio, Indiana and Kansas which if successful combined would increase the Confederacy to 35% of US territory and 61% of US population.

And in brief moments of lucidity, DiogenesLamp readily admits Confederates wanted, intended and could have taken over vastly more of US land, leaving a rump USA with maybe New England and the Upper Midwest.

But, according to true Lost Cause Mother Church doctrine, this was never an existential threat to the USA and the US had no "right" to defend itself against such military actions.

Your map doesn't go far enough. The Confederacy would have eventually acquired all the territories and many of the Northern states as well.

The economics would have made this happen. The South being independent would have broken New York's control over these other regions, and both the states and territories would have found it to be in their best financial interest to leave the USA and join the CSA.