IIRC, hemp was farmed enormously in the US around the early 1900s. Rayon, developed by Dupont, was becoming commercially successful and the Duponts (along with the Hearsts who owned much of the news and advertising outlets) launched campaigns agains hemp and in favor of Rayon. So the entire hemp plant, along with the tetrahydrocannabinol-containing cannabis, were illegalized.
Latest Answers