Cannabis Legalization Efforts in the United States During the 1900s

Before prohibition: cannabis as medicine and fiber

At the start of the 20th century, cannabis was a legal, commonplace ingredient in American pharmacy. Cannabis extracts and tinctures appeared in the United States Pharmacopeia from 1850 through 1942, sold by companies including Parke-Davis, Squibb, and Eli Lilly as remedies for pain, insomnia, and neuralgia ^[1] Strong evidence. Hemp had been grown in the US since the colonial era for rope, sacking, and paper.

Recreational smoking of cannabis flower — as distinct from oral tinctures — was uncommon among white Americans before roughly 1910. It entered the country in two main streams: Caribbean and Mexican laborers bringing the smoking habit north, and Indian and North African traditions circulating through port cities ^[2] Strong evidence.

State-by-state bans, 1911–1933

The first wave of prohibition was state-level and largely quiet. Legal historians Richard Bonnie and Charles Whitebread, in their landmark 1970 study The Forbidden Fruit and the Tree of Knowledge, documented that Massachusetts restricted cannabis in 1911, followed by California, Maine, Wyoming, and Indiana in 1913 ^[2] Strong evidence. By 1933, most states had some form of cannabis restriction on the books.

These laws were rarely the product of public outcry. Many were pharmacy-board additions tacked onto broader poison and narcotic statutes. In the Southwest, however, the framing was explicitly racial: legislators and newspapers linked "marihuana" to Mexican immigrants and used the plant as a pretext for deportation and policing ^[2][3] Strong evidence. The very shift from the medical term cannabis to the Spanish-derived marihuana was itself a rhetorical strategy to make the substance sound foreign and threatening ^[3] Strong evidence.

Federal prohibition and the Marihuana Tax Act of 1937

Harry J. Anslinger, appointed the first commissioner of the Federal Bureau of Narcotics in 1930, initially downplayed cannabis as a state problem. By the mid-1930s he had reversed course, promoting lurid stories of "marihuana-crazed" killers — often featuring Black and Mexican defendants — through congressional testimony and popular magazines ^[2][4] Strong evidence.

The Marihuana Tax Act of 1937 did not technically ban cannabis. It imposed a prohibitively expensive tax stamp requirement, then made it nearly impossible to obtain the stamp legally ^[1] Strong evidence. The American Medical Association's legislative counsel, Dr. William C. Woodward, testified against the bill, noting the AMA had not been properly consulted and that the term "marihuana" was being used to obscure the fact that Congress was banning a widely prescribed medicine ^[4] Strong evidence.

The often-repeated claim that the law was primarily a conspiracy by William Randolph Hearst (to protect timber holdings) and DuPont (to protect nylon) is Disputed. Historians including Bonnie, Whitebread, and Isaac Campos treat it as an oversimplification: yellow-press sensationalism and industrial interests played some role, but racialized policing anxieties and Anslinger's bureaucratic ambition are better documented drivers ^[2][3].

The Boggs Act, Narcotic Control Act, and the punitive 1950s

Postwar policy moved sharply toward punishment. The Boggs Act of 1951 established mandatory minimum sentences for cannabis alongside heroin and cocaine, and the Narcotic Control Act of 1956 raised them further — a first cannabis possession offense could carry 2 to 10 years and a $20,000 fine ^[1] Strong evidence. This period cemented the legal fiction that cannabis was pharmacologically equivalent to opiates, a framing that would shape the Controlled Substances Act 14 years later.

The Controlled Substances Act and the Shafer Commission, 1970–1972

The Comprehensive Drug Abuse Prevention and Control Act of 1970 replaced the 1937 tax framework with a scheduling system. Cannabis was placed in Schedule I — the most restrictive category, reserved for drugs with "no currently accepted medical use" and high abuse potential — provisionally, pending a commission report ^[1] Strong evidence.

That report, delivered in 1972 by the National Commission on Marihuana and Drug Abuse (the Shafer Commission), was titled Marihuana: A Signal of Misunderstanding. It recommended decriminalizing personal possession and use ^[5] Strong evidence. President Richard Nixon, who had appointed the commission, publicly rejected the findings. Tapes later released from the Nixon White House captured him disparaging the commission and linking cannabis policy explicitly to hostility toward the counterculture and civil-rights-era Black activism ^[6] Strong evidence. Cannabis stayed in Schedule I, where it remained through the end of the century.

Decriminalization wave, 1973–1978

Despite Nixon's rejection of Shafer, state-level reform accelerated. Oregon decriminalized possession of small amounts in 1973, reducing the penalty to a civil fine. Between 1973 and 1978, ten more states followed: Alaska, Maine, Colorado, California, Ohio, Minnesota, Mississippi, New York, North Carolina, and Nebraska ^[7] Strong evidence.

President Jimmy Carter formally endorsed federal decriminalization in an August 2, 1977 message to Congress, stating: "Penalties against possession of a drug should not be more damaging to an individual than the use of the drug itself" ^[8] Strong evidence. The moment passed. A parents' movement worried about teen use, combined with the scandal-driven resignation of Carter's drug policy adviser Peter Bourne in 1978, sapped political momentum.

The Reagan era rollback, 1981–1992

The 1980s reversed most of the decade's reform gains at the federal level. The Anti-Drug Abuse Acts of 1986 and 1988 reintroduced mandatory minimums, created the crack/powder cocaine sentencing disparity, and expanded civil asset forfeiture. The Comprehensive Crime Control Act of 1984 strengthened forfeiture tools used heavily in cannabis cases ^[1] Strong evidence.

Federal arrests for cannabis rose sharply through the late 1980s and 1990s. The racial disparities documented in enforcement — Black Americans arrested at several times the rate of white Americans despite similar use rates — are extensively covered in later ACLU and government analyses ^[9] Strong evidence.

Medical cannabis and Proposition 215, 1991–1996

The modern medical cannabis movement grew out of the AIDS crisis in San Francisco. Activist Dennis Peron, whose partner Jonathan West used cannabis for AIDS wasting syndrome before dying in 1990, organized San Francisco's Proposition P in 1991 — a non-binding measure supporting medical access that passed with 79% of the vote ^[10] Strong evidence. Peron opened the San Francisco Cannabis Buyers Club, the first large-scale medical dispensary in the US.

In 1996, California voters approved Proposition 215, the Compassionate Use Act, with 55.6% support. It allowed patients with a physician's recommendation to possess and cultivate cannabis for medical use ^[10] Strong evidence. Federal law did not change — the Clinton administration and drug czar Barry McCaffrey opposed the measure and threatened to revoke the DEA licenses of recommending physicians, a threat blocked by the Ninth Circuit in Conant v. Walters (decided 2002). By the end of 1999, Alaska, Oregon, Washington, and Maine had followed California's lead. The dam had broken, but the century closed with cannabis still firmly in Schedule I.

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