Why was hemp banned in the United States?

Hemp was effectively banned by the Marihuana Tax Act of August 2nd, 1937. The law did not technically prohibit hemp — it imposed a federal tax stamp on every stage of growing, processing, and selling the plant that was almost impossible to obtain. The campaign was driven by Federal Bureau of Narcotics commissioner Harry Anslinger and supported by newspaper baron William Randolph Hearst. The drug cannabis was the political target. Industrial hemp, the fibre crop, was the collateral damage.

Is 'Hemp for Victory' a real film?

Yes. In 1942 the US Department of Agriculture produced a fourteen-minute propaganda film called Hemp for Victory, urging American farmers to plant hemp because the Japanese invasion of the Philippines had cut off the country's supply of Manila rope fibre. Patriotic farmers planted around thirty-seven thousand acres that year. After the war the ban resumed and the USDA denied the film had ever been made for decades. Two VHS copies surfaced in 1989 and were donated to the Library of Congress, finally forcing the USDA to acknowledge it.

When did hemp become legal again in America?

The 2018 Farm Bill, signed into law in December 2018, legalised industrial hemp as an agricultural commodity. The bill defined hemp as any cannabis plant containing less than 0.3% THC by dry weight — a threshold too low to produce intoxication. The ban had lasted just over eighty years. Hemp clothing, paper, and food are now legally produced and sold across the United States, though the supply chain is still rebuilding decades of lost infrastructure.

The Fabric the U.S. Government Made Illegal: The Hemp Prohibition Saga

The United States government banned one of the oldest fabrics on earth in 1937, secretly filmed a propaganda piece begging farmers to grow it five years later, then denied the film ever existed for decades. The eighty-year saga of how a country erased its own oldest crop — and why hemp clothing is finally coming back.

TL;DR. Hemp built the US Constitution-era economy. It was effectively outlawed by the Marihuana Tax Act of 1937, briefly revived by the 1942 Hemp for Victory campaign, and finally legalised again by the 2018 Farm Bill. The fibre needs roughly a quarter of the water cotton does — and it is back on labels in 2026 for the first time in eighty years.

Eight Thousand Years of Sails, Ropes, and Canvas

Hemp has been spun into fabric for at least eight thousand years — there are hemp textile fragments from a Chinese burial site dated around 8,000 BCE. Sails. Ropes. Uniforms. Tents. The word canvas literally comes from cannabis. For most of human history, if a ship sailed or an army marched, it was on hemp.

In America, hemp was a major colonial crop. George Washington and Thomas Jefferson both grew it on their estates. The first drafts of the Declaration of Independence were written on hemp paper. Old Ironsides — the USS Constitution — had over fifty tons of hemp in her rigging. The covered wagons that crossed the Oregon Trail were canvassed in it.

1937: Anslinger, Hearst, and the Tax Act

Then come the 1930s and a man called Harry Anslinger. Anslinger ran the Federal Bureau of Narcotics. Prohibition had just ended and his agency needed a new enemy. He picked cannabis.

He partnered, depending on which historian you read, with newspaper baron William Randolph Hearst — who owned vast timber holdings that hemp paper would have competed with — and ran a campaign of frankly racist horror stories about a drug they made sure everyone called by its Mexican-Spanish name: marijuana. Most Americans had no idea it was the same plant as the hemp on their grandparents' farms.

On August 2nd, 1937, Congress passed the Marihuana Tax Act. The law did not technically ban hemp — it just made every step of growing, processing, and selling it require a federal tax stamp that was almost impossible to obtain. Industrial hemp got swept up with the drug. American mills started closing.

1942: Hemp for Victory

Then the plot twist almost nobody knows. Pearl Harbour. December 1941. The Japanese invasion of the Philippines cut off America's supply of Manila hemp — the rope fibre the US Navy depended on. Suddenly the same government that had killed the hemp industry needed it back overnight.

In 1942 the USDA produced a fourteen-minute propaganda film called Hemp for Victory, encouraging farmers to plant the crop they had just been told was forbidden. Patriotic farmers planted around thirty-seven thousand acres that year.

Then the war ended, the ban came back, and the government quietly pretended the film did not exist. For decades they denied it had ever been made. Two VHS copies surfaced in 1989, donated to the Library of Congress by — among others — actress Mia Farrow. Only then did the USDA admit it.

2018: The Ban Ends

For the next eighty years, growing hemp in America was a federal crime. The 2018 Farm Bill finally fixed it. The law redefined hemp as any cannabis plant containing less than 0.3% THC by dry weight — too low to get anyone high — and legalised it as an agricultural commodity.

Almost a century after the ban. A fibre that had been on American farms since the 1600s, gone for three generations, back on the books.

What Hemp Actually Is As a Fibre

The modern wardrobe lesson is the most interesting part. Hemp is genuinely one of the best fibres we have.

Water: Hemp uses around 2,700 litres of water per kilogram of fibre. Cotton, in many growing regions, uses closer to 10,000.
Pesticides: Hemp grows fast and dense enough to suppress most weeds. It needs almost no pesticides or herbicides.
Soil: It is a natural rotation crop. Its deep roots break up compacted soil and pull contaminants out of damaged land.
Performance: The fabric is tough, breathable, naturally antibacterial, and softens beautifully with washing — closer to linen with age than to its first wear.

The first wave of new American hemp clothing in the last five years has been quietly excellent. Hemp T-shirts. Hemp denim blends. Hemp canvas jackets. A generation of designers is rediscovering a fibre their grandparents would have known by name.

Why This Matters For What You Wear Today

When you see hemp on a label in 2026, you are holding a fabric that an entire country tried to erase — coming back, eighty years late, from a saga most people do not know was lived through.

Whether to actually buy it is the easy part. Hemp is one of the few fibres on the planet whose environmental case, durability case, and comfort case all point the same way. The harder part is finding it: brands still mostly default to cotton and polyester because the supply chain rebuilt itself slowly after such a long ban. If you want to vote with your wallet for a fabric the twentieth century lost on purpose, the place to start is the composition label. Anything that says hemp, or cotton-hemp blend, is a small piece of an industry being put back together.