I stand by my original post, which was a cursory google search of us history.

It wasn’t, or your horrible at it.

“when was weed made illegal” produces

…wikipedia.org/…/Legal_history_of_cannabis_in_the…

This

Which opens with

In the United States, increased restrictions and labeling of cannabis (legal term marijuana or marihuana) as a poison began in many states from 1906 onward, and outright prohibitions began in the 1920s. By the mid-1930s cannabis was regulated as a drug in every state, including 35 states that adopted the Uniform State Narcotic Drug Act.[1] The first national regulation was the Marihuana Tax Act of 1937.[2]

Which indeed makes your attempt to mock someone for poor research / knowledge very ironic indeed