International Relations began in the center of Mesopotamia with the union of the Sumer and Akkad states in the 5.000 BCE. Due to the closeness of the city-states, conflict and the desire for power led to the increasing role of war and politics. As a result, trade, social, and technological development became more relevant among neighboring societies. Therefore, Sumerian city-states emerged from a multicausal phenomenon that allowed the evolution of the first international system. Authors: Valentina Carratu, Emma Di Paolo and Marta Lladó