even though the practice of smoking opium in America long predated Chinese immigration to the United States. Tariff acts of 1832 established opium regulation, and in 1842 opium was taxed at seventy-five cents per pound. In New York, by 1870, opium dens had opened on Baxter and Mott Streets in Manhattan Chinatown, while in San Francisco, by 1876, Chinatown supported over 200 opium dens, each with a capacity of between five and fifteen people. After the Burlingame Commercial Treaty of 1880, only American citizens could legally import opium into the United States, and thus Chinese businessmen had to rely on non-Chinese importers to maintain opium supply. Ultimately, it was European Americans who were largely responsible for the legal importation and illegal smuggling of opium via the port of San Francisco and the Mexican border, after 1880. Since the early 19th century, opium was widely used as an ingredient in medicines, cough syrups, and child quieters. However, many 19th century doctors and opium experts, such as Dr. H.H. Kane and Dr. Leslie E. Keeley, made a distinction between opium used for smoking and that used for medicinal purposes, though they found no difference in addictive potential between them. As part of a larger campaign to rid the United States of Chinese influence, white American doctors claimed that opium smoking led to increased involvement in prostitution by young white women and to genetic contamination via miscegenation. Anti-Chinese advocates believed America faced a dual dilemma: opium smoking was ruining moral standards, and Chinese labor was lowering wages and taking jobs away from European Americans. Second wave (1949 to the 1980s) The Magnuson Act, also known as the Chinese Exclusion Repeal Act of 1943, was proposed by U.S. Representative (later Senator) Warren G. Magnuson of Washington and signed into law on December 17, 1943. It allowed Chinese immigration for the first time since the Chinese Exclusion Act of 1882, and permitted Chinese nationals already residing in the country to become naturalized citizens. This marked the first time since the Naturalization Act of 1790 that any Asians were permitted to naturalize. The Magnuson Act passed during World War II, when China was a welcome ally to the United States. It limited Chinese immigrants to 105 visas per year selected by the government. That quota was supposedly determined by the Immigration Act of 1924, which set immigration from an allowed country at 2% of the number