Incarceration in the United States is one of the primary means of punishment for crime in the United States. In 2023, over five million people were under supervision by the criminal justice system, with nearly two million people incarcerated in state or federal prisons and local jails. The United States has the largest known prison population in the world, it has 5% of the world’s population, and 20% of the world’s incarcerated persons. China, with four times more inhabitants, has fewer persons in prison. Prison populations grew dramatically beginning in the 1970s, but began a decline around 2009, dropping 25% by year-end 2021.

The war on drugs is the policy of a global campaign, led by the United States federal government, of drug prohibition, military aid, and military intervention, with the aim of reducing the illegal drug trade in the United States. The initiative includes a set of drug policies that are intended to discourage the production, distribution, and consumption of psychoactive drugs that the participating governments, through United Nations treaties, have made illegal.