Depends, of course, on the criteria. A state has an inside towards its citizens, and an outside toward the state system. Depends on domestic and foreign policy, in other words. That means it can fail in two ways, by not catering to its citizens and by not coming to terms with other states. Actually the two are closely related as often pointed out: a regime (running the state) may compensate for failure at home by victories abroad. And, conversely, compensate for failures abroad by taking good care of its citizens. And, success at home used to mobilize grateful citizens for patriotic wars abroad. America, or the USA rather, at present does not take good care of its citizens. A recent study cited in Nation of Change, More Evidence That Half of America Is in or Near Poverty, 24 March 2014, by Paul Buchheit: The Center on Budget and Policy Priorities...