求翻译：20世纪六七十年代，美国在全球经济中的地位开始下降，美元贬值，失业人数增加。在此情况下，为了提供就业岗位，促进经济发展，，各州纷纷设立对外贸易区。到1980年，全美的自由贸易区增加到77个。是什么意思？

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Century 20 670 s, the United States in the global economy began to decline, the depreciation of the dollar, increase in the number of the unemployed. In this case, in order to provide employment opportunities, and promote economic development, the introduction of new technologies, and the cantons ha

The 20th century 670 ages, US's start in global economy status to drop, US dollar depreciation, unemployment increase.In this situation, for the offer of employment post, the promotion economy development, introduces the new technology, various states set up foreign trading area in abundance.To 1980

In the sixties or seventies of the 20th century, the United States's position in the global economy began to decline in the dollar, an increase in unemployment. In this case, in order to provide jobs and promote economic development, introduction of new technologies, the cantons have set up trade zo

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