Nixon Declares War On Drugs

"America's public enemy number one in the United States is drug abuse. In order to fight and defeat this enemy, it is necessary to wage a new, all-out offensive."

Source: 

Richard M. Nixon. 37th President of the United States: 1969 ‐ 1974. Remarks About an Intensified Program for Drug Abuse Prevention and Control, June 17, 1971.