I Need An Answer That Solves The Following Conundrums Regarding Realism In Inter

I need an answer that solves the following conundrums regarding realism in international relations. You don’t need to specifically answer each one. 

Why is international relations so different from domestic politics? Why is violence between states more prevalent than violence within states? Why is there political development within states but so little among them? Why are international institutions weak?

 

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