从北美內战(一八六一——一八六五)以后,美国經济发生了显著的变化;这一变化的特点是,从旧的自由資本主义发展到垄断資本主义,亦卽帝国主义。在帝国主义阶段上,垄断組織的大規模生产及其对最大限度利潤的追求,迫使美国政府不得不采取比之以前更为卑鄙毒辣的手段在世界其他各地找寻商品銷售市場、資本輸出对象和原料供应地;正如美国資产阶級历史家毕尔德(Charles A.Beard)所承认的,从內战以后,美国需要“征服更多的世界”。 After the civil war in North America (1861 - 1865), the U.S. economy has undergone significant changes. The change is characterized by the development from the old free capitalism to monopoly capitalism and imperialism. At the imperialist stage, the mass production of monopolies and their pursuit of maximum profits forced the U.S. government to resort to more vulgar and sinister means than before to find merchandise sales markets, capital exporters and raw materials in other parts of the world As the U.S. bourgeois historian Bill A. Beard admitted, the United States needs “to conquer more of the world” after the civil war.