History of Marijuana

Chuck Cirino gives us a short history lesson on how marijuana became illegal in the US. The November 2nd ballot in California includes Proposition 19, which if passed would legalize various marijuana related activities in California.”  Via @LaughingSquid.  Now I haven’t given this topic much thought but I found the history interesting, especially the part about racism.  I couldn’t find anything on Wikipedia on this but you can Google around and find the same quotes.  Does anyone have any thoughts or links to support or discredit this?