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During World War II, American farmers were asked to grow hemp to aid in the war effort. Above, hemp rope was used during the manufacture of fighter jets.

shift began at the end of the 19th century. Opium addiction swept the world, and cannabis was targeted by the League of Nations as people began to question its use. In 1906, President Theodore Roosevelt signed the Pure Food and Drug Act. It required the labeling of all medicines including those containing marijuana. The act was designed to prevent the manufacture, sale, and transportation of “adulterated or misbranded or poisonous or deleterious foods, drugs, medicines, and liquors.” Massachusetts regulated marijuana in 1911, followed quickly by Indiana, Maine, Wyoming, New York City, Utah, Vermont, Colorado, and Nevada. In 1914, President WoodrowWilson signed the Harrison Narcotic Tax Act. When it went into effect in March 1915, the law limited the import and export of opium for medicinal purposes and imposed a tax on people who sold, distributed, or gave away opium or coca leaves. A large number of Mexican immigrants coming into the United States during the Mexican Revolution (c. 1910–1920) fueled fear of Mexican culture and its marijuana

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