Human behavior refers to the array of every physical action and observable emotion associated with individuals, as well as the human race as a whole. While specific traits of one's personality and temperament may be more consistent, other behaviors will change as one moves from birth through adulthood.
diplomacy(Noun) The art and practice of conducting international relations by negotiating alliances, treaties, agreements etc., bilaterally or multilaterally, between states and sometimes international organisms, or even between policies with varying status, such as those of monarchs and their princely vassals.
This situation gives you an idea of the world in which states live. International relations involves the study of such things as foreign policy, international conflict and negotiation, war, nuclear proliferation, terrorism, international trade and economics, and international development, among other subjects.