However, the day is coming (sooner rather than later) when the Federal Government will be unable to fulfill its obligations to the States simply because it won't be able to do any more deficit financing. The contract will be broken, not by the States, but by the Feds.
All these big spending Statists, who want to keep controlling more and more by spending more and more (think Obamacare) are making a huge mistake. Once the power of the purse is gone, the federal government will have no choice but to loosen its tight grip on the States.
Some sacrifices will need to be made but using trade is exactly the sort of confrontation I’m proposing in post 15.
Today we have an advantage that didn’t exist in the civil war era. We have instant communications and any federal pressure applied to the states involved in a “trade revolt” would spark immediate anger in virtually all the other states. Meanwhile the revolt states would be offering similar deals to states that wanted to join.