The question here is whether the American political system can meet the challenges that it faces, many of which it has aggravated. The US remains the greatest economic and military power in the world, but questions about its solvency have in turn cast doubt on its ability to act and lead in the world.
还有一个国家需要加入“不可测因素”列表，这个国家就是美国。这里的关键在于美国政治制度能否应对其所面临的挑战，这些问题曾因美国的参与而趋于恶化。美国仍然是全世界排名居首的经济和军事强国，但其偿付能力问题质疑了它的行动和领导能力。华盛顿最近发生的事件一直不太令人满意。今后一年，而且是未来十年甚至更长时间的全球发展将在很大程度上取决于美国能否很好地管理其国内挑战和分歧。