The answer is IDEOLOGY - A system of beliefs or ideas that justifies the social, moral, religious, political, or economic interests held by a group or by society.
In sociology, the concept above sums up the term "ideology". This set of beliefs plays an important role in shaping a society's thoughts, actions, structure, function, economic system of production, and political structure, and sometimes even culture.
Some examples of ideology include capitalism, communism, socialism and liberalism. A nation's objectives, policies, international relations, and interests are pretty much defined for its major ideology, which usually depends on the leading party that is in the government at the time.