Abstract
Studying international relations through political science is a way to understand the real incentives of the interactions states have to each other, and also to show the normative constraints, which are inherent in each state, for countries to bind together, to work with each other, or to go to war against each other. This is the reason why we may wonder if internal domestic politics have an influence on international relations.
In order to answer this question, we will study three theories: realism, institutionalism and state-society approach (or liberal theory). If both realists and institutionalists think that international relations are in a situation of anarchy lead by the hope to survive - where states are self-interested - institutionalists grant importance to the role of institutions in increasing the interactions between states. On the other hand, the liberalists, with the state-society approach, think that international relations are ruled by states' internal interests.
