Jamelle Bouie thinks 1820 offers a better view of today's politics than 1850 or 1968:
There is no one-to-one comparison from the past to current events; there never is. But drawing on the Missouri controversy, I do have an observation to make about our present situation. Once again, under the guise of ordinary political conflict, Americans are fighting a meta-legal battle over the meaning of both the Union and the Constitution.
A fight over the fate of the Supreme Court is weighty enough, but beneath the surface of this conflict is an even fiercer struggle about what the Constitution means, one taking place in the context of minority rule and incipient democratic failure.
Many democratic political systems allow for minority-led governments, although they often force parties to build majority coalitions to achieve them. That’s because minority government becomes an unacceptably bitter pill when the winning party rejects compromise and consensus in favor of factionalism and unilateral action. The problem comes when a political system allows for minority winners but doesn’t require coalition government. Stability is possible, but it depends on forbearance and good faith from all sides. You can play political and constitutional hardball, but it might bring conflict out into the open that you can’t ultimately control, and it will raise questions about your mandate to govern.
Trump, McConnell and the Republican Party have embraced a kind of political total war. Democrats and their liberal allies say this violates the democratic principles against which we judge the fairness of our institutions. In response, Republicans say the Constitution is what counts. Whether or not an action violates some abstract principle, if it’s in the rules, it’s in the rules.
The Missouri controversy was, of course, settled with a compromise. Missouri would enter the Union as a slave state, and Maine would enter as a free state, but Congress would prohibit slavery in all land of the Louisiana Purchase north of the 36° 30’ parallel. This defused the fight over the territory, but could not resolve the conflict over the Union. This was legislation, a good faith agreement between two irreconcilable sides, not a permanent addition to the constitutional framework.
The Republican Party has created a situation where no compromise is possible. Biden winning in five weeks won't change that. But at least a clear win, and taking the Senate back, will allow us to repair some of the damage that four years of Republican rule has inflicted.