How Racism Built America's War on Weed: The Untold History of Cannabis Prohibition

Here is a question that most Americans never think to ask: why is marijuana illegal in the first place?

Not "why is it controversial" or "why do some people oppose it." The more fundamental question. Why did the United States government decide, in the 20th century, to ban a plant that had been used medicinally for thousands of years, grown commercially in the American colonies since 1619, and sold in pharmacies across the country for decades?

The answer is not about science. It is not about public health. It is not about addiction or abuse potential or any of the clinical language that federal scheduling laws use today.

The answer is about racism. And the story is one that every cannabis consumer, every policy maker, and every American should know.

Before the Ban: Cannabis Was Everywhere

To understand how cannabis prohibition happened, you first need to understand what came before it. And what came before it was a country where cannabis was not just tolerated — it was encouraged.

In 1619, the Virginia colony passed a law requiring every farm to grow hemp. Not suggesting it. Requiring it. Hemp was considered so essential to the colonial economy — for rope, textiles, paper, and other industrial uses — that failing to grow it was essentially an act of civic negligence. The Founding Fathers grew hemp. George Washington grew hemp. The early American economy literally ran on it.

By the 1830s, an Irish doctor named William Brooke O'Shaughnessy was studying cannabis in India and documenting its remarkable medicinal properties. He introduced cannabis to Western medicine in 1839, and within a decade, medicinal cannabis preparations were available in pharmacies across America. By the 1850s, cannabis was listed in the United States Pharmacopeia — the official compendium of approved drugs.

Cannabis was not hiding in the shadows during this period. It was mainstream. By 1853, recreational cannabis use was described as a "fashionable narcotic" in popular publications. By the 1880s, there were an estimated 500 hashish parlors operating in New York City alone, sitting alongside the opium dens that catered to a different clientele.

Let that number sink in. Five hundred hashish parlors. In one city. In the 1880s. Cannabis was as much a part of American social life as the saloons that served whiskey.

So what changed?

The Mexicans Are Coming

What changed was demographics. And fear. And the oldest political trick in the American playbook: blaming a marginalized group for society's problems.

Between 1910 and 1920, the Mexican Revolution drove a wave of immigration to the United States. Mexican farmworkers crossed the border in large numbers, settling in Texas, California, and other border states. They brought their customs, their food, their music — and their practice of smoking marijuana to relax after long days of back-breaking agricultural labor.

Here is an important detail that often gets lost in the retelling: marijuana was significantly cheaper than alcohol. During Prohibition, when alcohol was illegal, marijuana became an even more attractive alternative for working-class people looking for affordable recreation. This was not a crisis. This was economics.

But to the white power structure of early 20th century America, it was a threat. Not because marijuana was dangerous — the medical establishment had been using it for decades with no alarm — but because the people smoking it were Mexican, and because those Mexican workers were competing for jobs with white laborers.

The language shifted. The plant that pharmacies had been selling as "cannabis" for years was rebranded as "marijuana" — a deliberately Spanish-sounding word designed to associate the plant with Mexican immigrants and trigger anti-Mexican prejudice. This was not accidental. It was a calculated political strategy. By calling it "marijuana" instead of "cannabis," prohibitionists could make a familiar, accepted substance sound foreign and threatening.

It worked. Between 1914 and 1925, twenty-six states passed anti-marijuana laws. Most of these laws passed with remarkably little debate or scientific inquiry. The question was never "is this substance dangerous?" The question was "who is using it, and can we use that against them?"

Enter Harry Anslinger

If the racist roots of cannabis prohibition have a single face, it belongs to Harry J. Anslinger.

Anslinger was appointed the first commissioner of the Federal Bureau of Narcotics in 1930. He was ambitious, politically savvy, and facing a problem: his agency needed a mission. Opiates and cocaine, which had been the primary targets of federal drug enforcement, were not generating enough headlines or sufficient justification for his bureau's growing budget.

Anslinger needed a new enemy. He found one in marijuana.

What followed was one of the most effective propaganda campaigns in American political history. Anslinger built his case against marijuana not on medical evidence or scientific research, but on racism, fear-mongering, and sensationalist storytelling. He compiled what he called the "Gore Files" — a collection of lurid stories linking marijuana use to violence, insanity, and sexual deviance, almost always involving people of color.

His public statements were not coded or subtle. They were explicitly, aggressively racist. Anslinger is on record saying that marijuana made Black people forget their "place" in society. His most infamous quote — and one that should be taught in every American history class — was his assertion that "Reefer makes darkies think they're as good as white men."

Read that again. The man who built the federal case for banning marijuana said, out loud, in public, that the problem with the substance was that it made Black people feel equal to white people. That is not subtext. That is the text.

Anslinger did not stop at targeting Black Americans. His propaganda also focused on Mexican immigrants and jazz musicians, who he described as a corrupting influence on white America. He explicitly linked marijuana to interracial relationships, presenting the idea of Black men socializing with white women as one of the terrifying consequences of cannabis use.

Reefer Madness and the Media Machine

Anslinger's campaign was not a solo act. He had help from the media, most notably from newspaper magnate William Randolph Hearst, whose publications ran sensationalist stories about marijuana-crazed minorities committing violent crimes. Hearst had his own motivations — he had invested heavily in timber for his paper mills and saw hemp as a competitive threat — but the racism was a feature, not a bug.

The 1936 propaganda film "Reefer Madness," which drew directly from Anslinger's Gore Files, depicted marijuana turning clean-cut young white Americans into violent, sex-crazed maniacs. The film is laughably absurd by modern standards, but at the time, it was presented as a documentary warning about a real threat to American society.

The media campaign worked exactly as intended. By framing marijuana as a drug used by racial minorities that threatened white society, Anslinger and his allies built the political support needed for federal legislation.

The Marihuana Tax Act of 1937

On October 1, 1937, the Marihuana Tax Act went into effect, effectively criminalizing cannabis at the federal level. The law did not technically ban marijuana outright — it imposed a tax so onerous and a regulatory structure so burdensome that legal use became practically impossible.

The passage of the Act was notable for several reasons. First, the American Medical Association opposed it. Dr. William Woodward, the AMA's legislative counsel, testified before Congress that the AMA was unaware that "marijuana" and "cannabis" were the same thing — a testament to how effectively the rebranding campaign had worked. He argued that there was no scientific evidence to support the claim that marijuana was dangerous and that banning it would impede legitimate medical research.

Congress ignored him.

Second, the congressional hearings were farcical. The bulk of the "evidence" presented consisted of Anslinger's anecdotal horror stories — the same Gore Files that had been feeding newspaper headlines for years. There was no rigorous scientific testimony supporting the ban. There was no comprehensive review of the medical literature. There was Harry Anslinger telling scary stories about minorities, and there were politicians who were either complicit in the racism or too cowardly to challenge it.

The Act passed with minimal debate. A plant that had been in American pharmacies for nearly a century, that had been grown in the colonies since 1619, that had been documented as medicinally valuable for thousands of years, was effectively banned based on racist propaganda and political opportunism.

The Decades of Damage

The consequences of Anslinger's campaign did not end with the 1937 Act. They compounded over decades, each layer of prohibition building on the racist foundation that came before it.

The 1970 Controlled Substances Act, signed by President Nixon, placed marijuana in Schedule I — the most restrictive category, alongside heroin and LSD. Nixon's own commission, the Shafer Commission, recommended decriminalization after studying the issue. Nixon ignored the recommendation. Years later, Nixon's domestic policy advisor, John Ehrlichman, admitted in an interview that the administration's drug war was explicitly designed to target Black people and the antiwar left.

The "War on Drugs" that followed was disproportionately waged against communities of color. Despite roughly equal rates of marijuana use across racial groups, Black Americans have been arrested for marijuana possession at rates three to four times higher than white Americans in virtually every state and every decade since data collection began.

These were not just statistics. They were lives destroyed. Jobs lost. Families separated. Voting rights stripped. Housing denied. Entire communities economically devastated by the cascading consequences of a drug conviction that was, from its very inception, rooted in racial prejudice.

The Long Walk Toward Justice

The movement to undo cannabis prohibition has been slow, painful, and still incomplete.

In 2012, Washington and Colorado became the first states to legalize recreational marijuana, nearly 75 years after the Marihuana Tax Act. Since then, state after state has followed, driven by changing public attitudes, mounting scientific evidence, and growing recognition that prohibition has been both ineffective and unjust.

Now, in 2026, the DEA is holding a hearing on rescheduling marijuana — the most significant federal reconsideration of cannabis policy since Anslinger first testified before Congress in the 1930s. The fact that we are having this conversation at all is a testament to decades of advocacy, research, and political organizing.

But let's be honest about what rescheduling is and is not. Moving marijuana from Schedule I to Schedule III is a step forward, but it does not erase the damage done. It does not expunge the criminal records of the millions of people — overwhelmingly people of color — who were arrested and convicted under laws that were racist from their inception. It does not restore the economic opportunities that were stolen from communities targeted by drug enforcement. It does not undo generations of harm.

Why This History Matters Now

Some people will read this article and think: "That was almost a hundred years ago. Things are different now. Why does the history matter?"

It matters because the history is not over. The system built on racist foundations is still operating. People are still being arrested for marijuana in prohibition states. People are still sitting in prison for cannabis offenses. The criminal records from marijuana arrests are still preventing people from getting jobs, housing, and educational opportunities.

It matters because understanding how we got here is essential to getting where we need to go. Cannabis policy reform that does not address the racist roots of prohibition is incomplete. Legalization without equity — without expungement, without reinvestment in affected communities, without deliberately addressing the racial disparities that were baked into the system from day one — is a half-measure that perpetuates injustice in a different form.

And it matters because the same playbook that Anslinger used in the 1930s is still being used today. When prohibitionist groups oppose rescheduling, when politicians argue against legalization, when enforcement agencies target cannabis businesses in communities of color while ignoring violations in affluent white neighborhoods, they are operating within a framework that was explicitly designed to be racist.

The words have changed. The suits are nicer. The racism is dressed up in the language of public health and public safety. But the structure is the same one that Harry Anslinger built, and it will not dismantle itself.

The Challenge Ahead

Cannabis was not banned because it was dangerous. It was banned because dangerous people decided that a plant used by marginalized communities could be weaponized against them. Every law, every arrest, every conviction, every life disrupted by cannabis prohibition traces back to that original sin.

As the rescheduling process moves forward, as more states legalize, as the public conversation about cannabis continues to evolve, we have a responsibility to keep this history front and center. Not as an academic exercise or a political talking point, but as the moral foundation for everything that comes next.

The question is no longer whether cannabis should be legal. The science settled that decades ago, and the public has caught up. The question now is whether we will build a legal cannabis system that acknowledges and repairs the damage caused by prohibition — or whether we will pretend that 95 years of racist policy was just an honest mistake.

It was not a mistake. It was a choice. And the choices we make now will determine whether the next chapter of cannabis history looks anything like the last one.