[lhjoypyr] Bred to be subservient

Hypothesize that the ability to get humans just to follow orders and not ask questions, and to be content and even enjoy that role, is a result of old-school genetic engineering, i.e., selective breeding. The hypothesized mechanism is that slavery has been so incredibly prevalent throughout human history that there exist likely many people who are not just descendants of slaves, but descendants of thousands of generations of slaves who underwent artificial Darwinian selection such that those who were not subservient were executed and not allowed to procreate.

This would mean there exists a "subservience" or "docility" gene or genes, which can be measured in people. Has it already been discovered but knowledge kept quiet? What other behavior characteristics does it cause?

Inspired by the horrifying politically incorrect belief espoused during the era of American slavery that the African was born naturally subservient. And we seem to have bred subservience into some of our pets, most notably dogs.

Science fiction often depicts an alien "slave race".

This does provide a possible scientific explanation of why Native Americans were unsuitable for being made into slaves, forcing the alternative of very expensive importation from Africa. Was slavery prevalent in those cultures?

(Update: The reason Native Americans did not make good slaves was likely their lack of immunity to diseases carried by the colonizers.  It is little surprising that there was enough regular contact between Europe and sub-Saharan west Africa for both regions to have gained immunity to the same diseases.)

Further update: The institution of slavery was already well established in west Africa, with Africans selling slaves to each other, long before the colonization of the Americas, long before whites entered the market.  To enslave Native Americans, colonist Americans would have had to construct such slave-making institutions, the local infrastructure, from scratch in the New World.  This might have taken generations.  (But they had generations.)  This isn't to say Africans have only themselves to blame for enslavement.  Certainly Atlantic slave trade massively changed incentives and induced huge changes in African institutions.

Does a gene explain why some people have an easier or harder time learning to follow in partner dancing?

Is the subservience allele being selected for or against in modern culture? Should it be?