It is more of a context of the circumstances scenario. The CSA from 1951 - 1969 underwent what can be called something not exactly a civil war, but not exactly just simple troubles either, exacerbated by Thurmond's hardline segregation policies which led a near state of civil war, which basically forced the hand of the government to loosen some segregation policies, including office rights, which allowed the Reformists to come to power in 1971 after two decades of basically chaos.
Don't let the numbers deceive you. Think of it like a Saudi Arabia or UAE or Kuwait or Bahrain or Qatar analogue. The CSA is heavily dependent on its natural resources - oil, mineral, natural gas, and agricultural resources for its economy, and is tied to the resource curse, making Income Inequality extremely high.
Oh it came to pass. But the CSA were thrown out of Cuba in the war and Spain didn't have the manpower to do anything but conduct a small blockade so both sides called it the quits and left. Cuba is tied to Spain in a Canada-Britain analogue ittl.