Realists tend toward the nature view.
Evidence that men may be programmed by evolution to seek dominance. Competition and dominance allows the strongest genetic line to perpetuate itself and hence insure the survival of the species 3. In absence of international authority to keep order and protect interests of states, each state must look out for its own interests and this requires getting and keeping power. The nurture view 1. People form civil societies in order to solve common problems and create desired futures that individuals can no longer achieve by themselves.