In the 1970s, President Richard Nixon formally launched the war on drugs to eradicate illicit drug use in the US. "If we cannot destroy the drug menace in America, then it will surely in time destroy us," Nixon told Congress in 1971. "I am not prepared to accept this alternative."
Over the next couple of decades, particularly under the Reagan administration, what followed was the escalation of global military and police efforts against drugs. But in that process, the drug war led to unintended consequences that have proliferated violence around the world and contributed to mass incarceration in the US, even if it has made drugs less accessible and reduced potential levels of drug abuse.