In 1937, consumption and sale of cannabis (as hemp for clothing and rope and in cigarette form) was illegal without the purchase of a federal tax stamp. Congress didn't think it had the authority to outlaw a plant, so they imposed a hefty tax instead. Then, to legally make marijuana illegal, Congress simply stopped issuing the tax stamp--and without a tax stamp, it was illegal to buy or sell cannabis.
The first message sent by Morse code was, "Everything worked well," not "What hath God wrought?" That came in a later public demonstration on May 24, 1844. It wasn't even Morse's idea to send that particular memorable message--it was Annie Ellsworth, the daughter of the commissioner of patents, who suggested it.