美国是世界上成功协调区域经济关系的大国。不断协调区域经济关系,伴随美国经济发展的整个历史,其中政府行为作用显著。南北战争后,政府主要通过宽松的土地政策和大规模投资交通设施、尤其是铁路,实现了全国统一大市场的形成和经济活动的广泛扩散。1929—1933年的大危机后,美国 The United States is a great power in the world that succeeds in coordinating regional economic relations. Continuously coordinate the regional economic relations, accompanied by the entire history of the U.S. economic development, in which the government acts have a significant effect. After the Civil War, the government realized the formation of a unified national market and the widespread diffusion of economic activities, mainly through loose land policies and large-scale investment in transportation facilities, especially railways. After the Great Crisis of 1929-1933, the United States