IR Theory

Can we create a world with shared norms and values to successfully meet collective threats to humankind? Should nations always behave the way they are doing now in the international arena? Can't they relate to each other differently? What prevents them from doing what is in their own interests?
With such questions in mind, the author explores major IR theories that attempt to explain war, peace and commerce across nations. Though this does not give any ready-made answers to those questions, this can be a guide in one's search for answers.