Realism ______. Question 31 options: 1) is the systematic study of political behavior institutionalized at the turn of the 20th century 2) is characterized by an interstate system in which two states hold the most significant power 3) describes a political philosophy that sees the struggle for power and the potential for conflict as a necessary evil in pursuit of national interest 4) describes a political philosophy stemming from the democratic tradition that emphasizes the potential for cooperation among states