求翻译：上世纪60，70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，为了刺激对外贸易发展，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？

The 1960s and 1970s , the US position in the global economy began to decline, the dollar, the increase in unemployment .

The 60 and 70 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 stimulate development of foreign trade, the States have set up foreign trade zone. In 1980, the United States of a free-trade

On the century 60,70 ages, US's start in global economy status to drop, US dollar depreciation, unemployment increase.In this situation, in order to stimulate the foreign trade development, various states set up foreign trading area in abundance.To 1980, the entire America's free trading area increa

60 of the last century, 70, 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 stimulate the development of foreign trade, the cantons have set up trade zones. By 1980, the free trade area across the United States

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