Most of human history, marijuana has been completely legal. It’s not a recently discovered plant, nor is it a long-standing law. Marijuana has been illegal for less than 1% of the time that it’s been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.
The marijuana plant, of course, has an incredible number of uses. The earliest known woven fabric was apparently of hemp, and over the centuries the plant was used for food, incense, cloth, rope, and much more. This adds to some of the confusion over its introduction in the United States, as the plant was well known from the early 1600′s, but did not reach public awareness as a recreational drug until the early 1900′s.
US's first marijuana law was enacted at Jamestown Colony, Virginia in 1619. It was a law “ordering” all farmers to grow Indian hempseed. Hemp was such a critical crop for a number of purposes that the government went out of its way to encourage growth.