The Marihuana Tax Act of 1937 is passed in America, the effect of which is to render marijuana and all its by-products illegal.

The Marihuana Tax Act of 1937, Pub. L. 75–238, 50 Stat. 551, enacted August 2, 1937, was a United States Act that placed a tax on the sale of cannabis. The H.R. 6385 act was drafted by Harry Anslinger and introduced by Rep. Robert L. Doughton of North Carolina, on April 14, 1937. The Seventy-fifth United States Congress held hearings on April 27, 28, 29th, 30th, and May 4, 1937. Upon the congressional hearings confirmation, the H.R. 6385 act was redrafted as H.R. 6906 and introduced with House Report 792. The Act is referred to, using the modern spelling, as the 1937 Marijuana Tax Act. It was overturned in 1969 in Leary v. United States, and was repealed by Congress the next year.

Cannabis, commonly known as marijuana, weed, pot, and ganja, among other names, is a non-chemically uniform psychoactive drug from the Cannabis plant. Native to Central or South Asia, cannabis has been used as a drug for both recreational and entheogenic purposes and in various traditional medicines for centuries. Tetrahydrocannabinol (THC) is the main psychoactive component of cannabis, which is one of the 483 known compounds in the plant, including at least 65 other cannabinoids, such as cannabidiol (CBD). Cannabis can be used by smoking, vaporizing, within food, or as an extract.