في القرن العشرين، عانت الولايات المتحدة من حربين عالميتين وصراعاتٍ عسكرية أخرى مؤلمة ومُكلفة. الكساد، وعشرات من حالات الركود والذعر المالي، أزمات البترول، وباء الإنفلونزا، واستقالة رئيس مُخزية. ومع ذلك، ارتفع مؤشر داو جونز من 66 إلى 11497.

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