The constitution of the United States was the result of compromise between those who wished to centralize the various states, and those who valued their states independence. In that early period, one was more likely to identify as a denizen of their particular state than as an American. The compromise was far from perfect, and the tensions between state sovereignty and national unity would be a defining issue of the first half of the nineteenth century. The Civil War put an end to that struggle, establishing the nation as supreme and the states as secondary, almost irrelevant. In the aftermath of the Civil War, there were several changes to the constitution, reflecting the freeing of the slaves, but the structure of the union evolved without changes to the constitution.
Can you envision a scenario where, after the conclusion of the Civil War (or perhaps during it?), the USA calls a constitutional convention to write a new constitution to govern the post-slavery, post-"states rights" era? 1865 seems close enough to the pronouncement of Thomas Jefferson that a new convention should be held every generation so as not to seem too outlandish. PODs in the antebellum period before the war are acceptable.
Can you envision a scenario where, after the conclusion of the Civil War (or perhaps during it?), the USA calls a constitutional convention to write a new constitution to govern the post-slavery, post-"states rights" era? 1865 seems close enough to the pronouncement of Thomas Jefferson that a new convention should be held every generation so as not to seem too outlandish. PODs in the antebellum period before the war are acceptable.