But the ramifications of that loss extended far beyond the end of slavery and we will see those issues again. Our Federal Government was supposed to be a Federal Government (very limited in power) while the State Governments were supposed to have more power. Instead, we now have a National Government, and the States have been stripped of much of their power. That is regrettable, as the National Government imposes one-size-fits-all standards where one size doesn't fit, while the states have become rubber stamps for the National Government.
Then lets work together to reduce federal power to the limits appropriate to it.
Perhaps begin by shutting down the departments of Education, Labor, and Agriculture, all fields well known to the founders, and all fields where congress has no enumerated powers.
The South's failure to diversify was its own fault.
That concept died long before Lincoln. Virtually every president from Washington to Jefferson and Jackson on through Polk consolidated power. Washington sent troops into Pennsylvania to suppress rebellion. Jefferson doubled the size of the country. Jackson told South Carolina, "If one drop of blood is shed in opposition to the law, I will hang the first man I can lay my hands on from the first tree I can find." Polk started a war with Texas and almost started one with the UK. Lincoln didn't expand the power and scope of the federal government any more than many of his predecessors had.
That is regrettable, as the National Government imposes one-size-fits-all standards where one size doesn't fit, while the states have become rubber stamps for the National Government.
The blame for that lies more with the Roosevelts, Wilson, LBJ, and his successors than with Abraham Lincoln.