OK, so a similar event could be a civil unrest with the US army climbing in, and then a huge group of people declaring their independence. Or one of the States, or a number of States, declaring their independence.They declared independence and ordered the Feds to vacate their bases. The war started with the Northern invasion, though the attack on Ft. Sumpter, which was located on land owned free and clear by the Feds, was off base and shouldn't of happened.