Go look at the Scottish peerage 400 yrs ago. Try 2-3gen marrying as de rigueur across that island. And they are recent (genetically) ancestors to a (still) majority of Americans.

All tribes have inbreeding and then despicable behavior to boot. You want to analyze despicable behavior try reading on the doings of the British Empire. Brittania was politely barbarous, my ancestor(s) included.

The sooner we recognize our commonality both in love, culture, beauty, art, and jealousy, fraud, rage and psychopathy we can skip this agitprop and turn our backs to you Divideandconquerors.