So Lincoln won the way Trump won, and a lot of people were dissatisfied with that result, even though it was in accordance with the Constitution of the United States. The electoral college chooses the president, like or dislike the results. that is the law of the Land. So the Southern States were dissatisfied that the Nation followed the Constitution in electing Lincoln, instead of their man.
Trump was a heck of a lot closer to a majority than Lincoln was, and is pushing towards the Union fulfilling the things it was purportedly established for in the way that it was established.
Other than all those important things, the situations are identical.
I don’t think the North East and California would have as good a case for pulling out as South Carolina did, but in my judgment, you don’t need a case, and if they want to go, Sionara.