The primary splitting of the psyche into conscious and unconscious seems to be the cause of the division within the tribe and the settlement. It is a division founded on fact but not consciously recognized as such.
Jung argues that social bifurcations such as tribal moieties and dual kingship are projections of the foundational psychic split between consciousness and the unconscious.
, The Practice of Psychotherapy: Essays on the Psychology of the Transference and Other Subjects, 1954thesis