The trading between China and the West during the 19th century seemed to be done more out of necessity than anything else; China, realizing that they offered goods that the British had grown accustomed to opened up trade through the Port of Canton. In the 21st century much of the same supply and demand practices still hold true, the major changes in global economy come by way of the laws that are put in place, in the 19th century where it was not illegal to trade opium, today's laws forbid the sale or trade of this as well as other drugs. (Sayre, 976)
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