Caucasians / Mongoloid have been civilized (medical, rotation farming, written language, written history) for close to a millennium 50/70 generations or so, this effects your epi-DNA, causing you to become less animal and more civilized.

Negroids have only been introduced to civilization for 10 or so generations here in America, so their DNA hasn't converted to a less animal more civilized version.

Just the facts please.