In 1648, the Peace of Westphalia treaty reshaped European political authority. Before this moment, medieval Europe operated under a vague religious hierarchy. The treaty established sovereign states as fundamental units of power. It declared that rulers held absolute authority within their own borders. No external superior could dictate internal affairs to these new entities. This shift created the modern international system we recognize today. The Treaty of Utrecht in 1713 further refined these norms. It confirmed that sovereigns had no equals inside their territory and no superiors outside it. These principles now underpin global legal and political orders. Yet even then, layered systems of sovereignty persisted within complex empires like the Holy Roman Empire. The concept spread globally through colonialism and later decolonization efforts during the Cold War era.
Realism And Power Struggles
Thucydides wrote his History of the Peloponnesian War in the fifth century before Christ. His account of Athens versus Sparta remains a foundational text for realist theory. Realists assume the international state system exists in a condition of anarchy. No overarching power restricts how sovereign states behave. Consequently, nations engage in continuous struggles to augment military capabilities or economic strength. They seek diplomacy relative to other states to protect citizens and vital interests. States act as unitary rational actors where central decision makers represent most foreign policy choices. International organizations appear merely as tools used by individual states to advance their own agendas. E.H. Carr, Hans Morgenthau, and Kenneth Waltz developed major theories within this framework. Their work explains conflicts from early European wars to Cold War tensions between the United States and Soviet Union. Realism suggests politics follows objective laws rooted in human nature rather than subjective preferences.