External challenges do sometimes bring down states. But, more frequently, the big problems are internal – the regime cannot deliver growth, its legitimacy fades, and people start to head for the exits (or at least get their money out).
外部挑战有时也会拖垮整个国家。但更频繁出现的情况时是国家内部出现了大的变故——政权无法实现经济增长，失去其合法性，人民开始设法转移到其他国家（或至少将资金转移出国）。