Since world war ii, the United States on the world economy has always maintained the leading position. The enterprise in order to meet the ever-changing competition and survival environment, according to the cost and efficiency don't break the production department, the production link, and even the production elements to adjust and keep competitive, additional value higher departments and industry. The United States economic structure after industry senior change adjusted, some primary products such as daily necessities, raw materials and working and industrial production of semi-finished products are transferred to developing countries, and these products and the production and living consumption will need, which determines that the United States imports from the international market are the primary industry products
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