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美国曾经是一个地区经济发展很不平衡的国家。在美国,19世纪以前其经济核心区位于大西洋沿岸的东北部和五大湖地区。当时的南部、西部和山地诸州等地的经济发展比较落后。为了促进落后地区的经济发展,美国政府当时就推行以开发西部为主的区域经济政策。自19世纪中期起,美国的新区开发逐步向有丰富的煤、铁、铜等矿产资源,土地肥沃,气候湿润,有广阔的森林和牧场的中西部地区转移,并在20世纪20年代达到高潮,使中西部地区发展成为一个工业和粮食、畜产品供应的综合性基地。二次大战后,特别是自20世纪60年代以来,美国又把开发重点转到拥有丰富的石油资
The United States used to be a country with a very uneven regional economic development. In the United States, nineteenth Century ago its economic core area is located in the northeastern Atlantic coast and the Great Lakes region. At the time, the economic development in the southern, western and mountainous regions of the country lagged behind. In order to promote the economic development in the backward areas, the U.S. government at the time promoted the implementation of a regional economic policy featuring western development. Since the mid-19th century, the development of new areas in the United States has gradually shifted to the central and western regions rich in coal, iron, copper and other mineral resources, fertile land, humid climates and vast forests and rangelands and culminating in the 1920s So that the central and western regions will develop into a comprehensive base for supplying industrial, food and livestock products. After the Second World War, especially since the 1960s, the United States has shifted its focus of development to the oil-rich