20世纪,世界各国为使其经济和社会发展步入良性循环,纷纷仿效美国等发达国家制定扶植政策,吸引国内外资金开发西部等落后地区,它们的经济主要体现在:一是灵活优惠的土地开发利用政策有利于推进西部大开发的进程;二是中央政府应因地和因时制宜地赋予西部各省更大的自主权;三是重 In the 20th century, in order to put their economic and social development into a virtuous circle, all countries in the world followed the example of developed countries such as the United States to formulate supporting policies and attract domestic and foreign funds to develop backward areas such as the western region. Their economies are mainly reflected in the following aspects. First, flexible and favorable land The development and utilization policies are conducive to advancing the course of the development of the western region; second, the central government should give greater autonomy to the western provinces due to local conditions and time; and