During the Great Depression, massive unemployment increased public resentment and fear of Mexican immigrants, escalating public and governmental concern about the problem of marijuana. By 1931, 29 states had outlawed marijuana. Then in 1937, "The Marihuana Tax Act", was enabled which officially prohibited recreational use but medical use was still legal.
The Controlled Substances Act is enacted, officially prohibiting cannabis for any use (medical included) at the federal level.
In 1996 California became the first state to make medicals marijuana legal again.
In 2012 both Colorado and Washington become the first states to legalize marijuana recreationally
Why it should be Legalized
The United States could benefit greatly from the added tax revenue that marijuana would bring in. The money that marijuana brings in now would only get greater with legalization which would stimulate the economy. Additional funds could also be used for government funded programs that help people with addiction, and the perception of drug use can be moved from that of a criminal offense to that of a mental health issue.
Many patients who have cancer ask to be prescribed medical cannabis to help deal with the pains of cancer and the pains of chemotherapy. The simple prescription of cannabis can also give patients their appetite back, and with that some strength to fight. Medical marijuana not only helps those suffering from illnesses but also those who develop behavior and learning disorders.
Focusing Resources on more serious issues
If marijuana was legalized, the police and the feds could focus on problems in America that matter. This includes, sex trafficking, alcoholism, the racism associated with marijuana, and heavy drugs that should stay illegal like heroin or meth.