This document discusses the history and economic costs of the War on Drugs in the United States. It outlines how the War on Drugs began in the 1970s under Nixon and expanded greatly under Reagan. By the 2010s, the U.S. was spending over $15 billion annually on enforcement and interdiction efforts. This document argues that continuing prohibition is extremely costly to taxpayers and misses opportunities to fund alternative programs. It also notes that legalizing and taxing marijuana at the state level has generated billions in tax revenues.