The Cold War is the result of rising tensions between the U.S. and Russia/U.S.S.R. following World War II. The relationship between the two nations was borne out of their contact and the impact that their decisions had on each other, where each nation had to calculate their behavior in accordance with the other. The other examples are groups of states with common interests, and therefore bind themselves to a common set of rules in their relations with one another, forming a society of states.