The beginning of modern war on drugs in the United States is commonly credited to President Richard Nixon, who evoked fears of crime, degenerate youth, and foreign drugs to garner support for his massive, by early 1970s standards, effort to combat drugs in the United States. Scholars now agree, however, that the essential characteristics of the “war on drugs” stretched back to the early 20th century. The first federal law to prohibit a narcotic in the United States passed in 1909 and banned the import of “smoking opium.” Although opium itself remained legal, opium prepared for smoking—a form believed to be consumed predominantly by ethnic Chinese and imported into the United States—was not. All future anti-narcotics policies drew on these foundational notions: narcotics were of foreign origin and invaded the United States. Thus, interdiction efforts at U.S. borders, and increasingly in producer countries, were an appropriate response. Narcotics consumers were presented as equally threatening, viewed as foreigners or at the margins of American society, and U.S. lawmakers therefore criminalized both drug use and drug trafficking. With drugs as well as drug users defined as foreign threats, militarization of the efforts to prohibit drugs followed. In U.S. drug policy, there is no distinction between foreign and domestic policy. They are intertwined at all levels, including the definition of the problem, the origin of many drugs, and the sites of enforcement.