Well, if a few deep blue states want to secede, that's fine with me. We can either make it amicable and set terms, including their assuming share of the Federal debt, half in proportion to GDP contribution, half in proportion to population, giving us permanent leases on any military facilities we find particularly valuable, pegging their currency to the dollar for a period of five years before letting it float, a long free trade agreement, allowing counties adjacent to states remaining in the Union to hold plebscites about whether to remain in the seceded state and join the new country or to join the neighboring state remaining in the Union and abiding by the results, and paying for a voluntary exchange of populations in which those wishing to leave the seceded state to remain in the US have their moving expenses paid by the seceding state, or we can oppose it invade and impose radical reconstruction. Either way would be fine with me.
