Is there any actual evidence this is true? A memo, or even a documented conversation?
In any event drug prohibition laws in the US started the year after Nixon was born, so even if Nixon sought to use them for his own nefarious purposes that doesn't address the actual prohibition.
>The U.S. influence over the U.N., and aid and trade leverage, along with China's historic political issues with opium...
Yes, and what were China's "historical political issues" with opium? That Chinese society was damaged by carrying the dead weight of so many opium addicts, and they couldn't make it illegal because the British wouldn't let them? Tell me again how this supports the argument Western countries forced drug prohibition on China when the reality was exactly the opposite?
>It was subsequently used to fund black ops by unaccountable intelligence agencies, and build the prison-industrial complex which has destroyed a generation of Black Americans.
That's quite a stretch. Yes, the US supported some groups in Central America that paid the bills with drugs. Just like every group of revolutionaries in Central America. The fact that you support a group with money, information, or advice doesn't mean you own it.
This from California:
"At midyear 2013, 90% of inmates had a current or prior violent or serious felony conviction, and 16% were registered sex offenders."
http://www.ppic.org/main/publication_show.asp?i=702
That "generation of [b]lack Americans" is in prison because of violence, not drugs. The idea there's some big conspiracy wherein The System Keeps The Black Man Down with drug laws just isn't borne out by the numbers.