This isn’t 1861, friend. The political will to militarily subjugate one or more secessionist states no longer exists in this country, either inside or outside the beltway.
There wasn’t the will for americans to go to war with other americans right up until the moment that there was. I’m hoping you don’t need examples of how quickly the will of a country can drastically change on this day of all days. A state trying to sucede now would be put down fast and hard because killing is so much less personal now. In the 1860’s you needed to be looking at a man to kill him. Now it can be done from an air conditioned control room on the other side of the planet.
For one thing, female voters wouldn't support a bloody domestic war that would destroy their extended families and the economy, and create masses of dying refugees of women and children.
Already politicians have to do baby talk and avoid foreign affairs and military issues to win the female vote, and someone thinks that suddenly the democrat party will be running candidates calling for a domestic Armageddon, because the tax collections will change?