While this is incredibly unlikely and verging on ASB I want to give a scenario that has been discarded hundreds of times another closer look. The Red Rebellion was a massive uprising of black people in the CSA that shook the nation while it was attempting to battle the USA. While the uprising was eventually crushed it took serious heart out of the confederate war effort with the united states helping them out. So what would be the outcome if the uprising managed to consume the confederate states and form a new polity based on Marx, Engels and Lincoln?