Yup, and we are united by our common tribal ancestry which has left us all with a desire to belong to a group, to have an affinity for those like us, and to distrust those who aren’t like us.
How much we are able to, or choose to use our intelligence to filter our genetic predispositions in deciding who’s “like us” and who’s “not like us” is a very interesting subject. – off to try and find some interesting articles.
The Human Zoo by Desmond Morris explains this quite well. Haven’t read it since my late teens, though, so I may be wrong.