It would take very little to act as a spark. The US is lost, at least, and most importantly in terms of the people's faith in their Government.
These are pivotal times; With Russia and China under threat of expulsion from the Mediterrean, Syria, the backer of Hizbullah and ally of Iran under threat, and worst of all, a totally myopic aneamic western leadership, guided by a shadowy shadow group of ideologues.