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This timeline was created as part of the [Republic of Cannabis](http://www.kqed.org/news/bayarea/republicofcannabis/), a project of the Center for Investigative Reporting and KQED.;xNLx;;xNLx;Reported by Julia Bernstein and Lisa Pickoff-White;xNLx;;xNLx;Produced by Lisa Pickoff-White
Governor Eugene Foss signs the first law prohibiting marijuana in the United States.
The Marihuana Tax Act banned the recreational use of marijuana through prohibitive taxation/penalties.
Samuel R. Caldwell, 58, of Denver, Colorado, became the first marijuana seller arrested under federal law. He was also the first convicted, and spent four years in Leavenworth Penitentiary.
The United Nations creates an international treaty to ban marijuana, along with other narcotics.
While the 1937 tax act prohibited marijuana, it did not ban it. So in 1970 the federal government clarified that with the Controlled Substances Act, which bans specific drugs from any use.
The National Organization for the Reform of Marijuana Laws forms with a $5,000 grant from the Playboy Foundation.
The Nixon-appointed Shafer Commission finds evidence that the "gateway theory" of marijuana use is false.
Oregon becomes the first state to affirm the Shafer Commission's recommendation to decriminalize a small amount of marijuana for adult, personal use.
Robert Randall becomes the first medical cannabis patient in the U.S.
President Jimmy Carter addresses Congress on the subject of drug addiction and illegal substances. During his campaign he spoke about decriminalizing marijuana.
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