Why do you assume only external threats? Keep going with the extreme (and accelerating) inequality and there will be a breakdown. Look at your debt levels. Look at internal issues. Education/healthcare hyperinflation. Disrepair of infrastructure. Massive incanceration rate. Exploitative employment practices. Wage stagnation. Police brutality. Corruption/wastage in public projects (Big dig, for example, hyperoverpriced subway) Do you think it can be fixed in time? Is it even possible to have a factual, problem oriented discussion, when both sides of political discourse are too tangled into ideology to try and solve the real, underlying problems? How long is it before it all boils over? And lets not even go to the actual military might - a lot of your current procurement programs are completely dysfunctional: the helicopter contract, Bradley controversy, F-35 fiasco, Ford carriers issues, the LCS joke, Raptor cancellation, just from the top.