International Relations and International System Introduction

Historical Foundations of International Relations

The relationship among human communities is an ancient phenomenon that has assumed multiple forms throughout the course of human history. The formal crystallization of these relations occurred with two major developments. First was the emergence of the sovereign nation-state following the Peace of Westphalia in $1648$, an agreement that brought an end to the Thirty Years’ War. Second was the rise of the concept of national interest, which came to prominence as the principal foundation of state policy at the international level.

Origins of International Relations as an Academic Discipline

International relations emerged as a distinct field within political science during the twentieth century, driven by several key developments. The international system acquired a global character as the United States and Japan entered the sphere of influence in international politics. Prior to this shift, the system had been dominated primarily by European powers, including Britain, France, Germany, and Austria. Furthermore, a growing absence of global security became evident, particularly in light of the catastrophic events of the First and Second World Wars.

The United States played a significant role in the development and dissemination of international relations as a specialized academic discipline. Initially rooted in American universities, the field later spread to other Western institutions. This development was facilitated by the United States’ departure from the Monroe Doctrine of non-intervention. As it moved toward strengthening its status as a major power, the United States expanded its sphere of influence and began coordinating its relations with other states more actively. Following the Second World War, international relations became an established academic subject in universities worldwide. The independence of numerous states during this era led to the emergence of new actors on the international stage.

Conceptual Definitions and Scope of International Relations

There is no single, comprehensive, and universally agreed-upon definition of international relations; instead, multiple definitions exist. These can be categorized into two main types. The first type comprises classical definitions that focus exclusively on relations among states. The second type is broader in scope, encompassing not only states but also non-state actors such as intergovernmental organizations, non-governmental international organizations, and multinational corporations.

A functional definition of international relations is the effort undertaken by a state or any other international actor to influence, in one way or another, another state or international actor. This definition is characterized by two main features: it does not confine the study of international relations to states alone, and it emphasizes that the primary objective of international actors is to exert influence on one another.

Patterns and Distinctions in International Interactions

International relations generally follow two primary patterns: cooperation and conflict. Cooperation encompasses multiple levels, starting with friendly relations and potentially escalating to the level of union or integration among the concerned parties. Conflict ranges from the exchange of unfriendly statements and accusations to the extreme level of war.

It is important to distinguish between International Relations and Foreign Policy. International Relations refers to the interactions among the units of the international system, whether they are states or non-state actors. In contrast, Foreign Policy refers to the policy through which a state defines its international objectives and the tools it employs to achieve them, with the state and its official representatives acting as the primary actors.

Methodological Framework: Levels of Analysis

Social phenomena in general—and political phenomena in particular—are complex and interconnected, making them difficult to explain through a single factor. Levels of analysis help to reduce this complexity and disentangle these interconnections. In some cases, it may be necessary to combine more than one level of analysis to achieve a more comprehensive understanding. In International Relations, there are three primary levels of analysis:

The Individual Level focuses on decision-makers, emphasizing factors such as their personal traits; social, educational, and professional backgrounds; and their cognitive and ideological orientations. The State Level examines the impact of a state’s political and economic system on its behavior at the international level. The International System Level analyzes how the structure of the international system and the balance of power within it influence states’ positions and policies at the global level.

The Nature and Structure of the International System

The international system is defined as the structural arrangement or ordering of international actors—primarily states—according to their varying capabilities, which include economic, military, political, geographic, demographic, and cultural factors. The relationships and interactions among them are governed by a set of legal rules that have been agreed upon and have become established in practice. While the actors within this system include both state and non-state entities, the state remains the principal actor.

Key components of the system include the existence of actors (with the state at the forefront), the presence of interactions among these actors, and a particular distribution of power—or balances of power—that shapes relationships. A body of legal rules exists to regulate and organize these relationships, embodied in international law or in bilateral and multilateral agreements and treaties that states consent to and commit to uphold. The structure of the international system typically takes a hierarchical form, ordered by capabilities: global powers are followed by regional powers, which are followed by smaller states.

Historical Evolution and Phases of the International System

The international system is dynamic rather than fixed; a new international system often emerges from the collapse of a preceding one. Its evolution can be categorized into four distinct phases.

Phase One ($1648$–$1914$) followed the Peace of Westphalia and the emergence of the nation-state. During this period, state power became largely synonymous with military capability, and Europe was the dominant force in the international system.

Phase Two ($1914$–$1945$) spanned from the First World War to the outbreak of the Second World War. This period was characterized by the emergence of a collective security framework, most notably through the establishment of the League of Nations under the Treaty of Versailles in $1919$.

Phase Three ($1945$–$1989$) was defined by Bipolarity and the Cold War between the United States and the Soviet Union. This era was marked by an intense ideological confrontation between the Western liberal bloc and the Eastern socialist bloc, alongside a nuclear and conventional arms race. The United States led the Western bloc through the North Atlantic Treaty Organization (NATO), established in $1949$, while the Soviet Union led the opposing bloc through the Warsaw Pact, founded in $1955$. The United Nations was established in $1945$ as a framework for international cooperation and collective security. Additionally, the Non-Aligned Movement was founded in the $1950s$ on the initiative of President Gamal Abdel Nasser of Egypt, Nehru of India, and Tito of Yugoslavia; however, in practice, its policies often fluctuated between the two rival blocs.

Phase Four ($1989$–present) is characterized by Unipolarity following the collapse of the Soviet Union and the rise of globalization. This phase saw the United States’ dominance over the international system, sometimes with limited adherence to international legitimacy, relying instead on its military, nuclear, and economic power, as seen in the $2003$ invasion of Iraq. However, this unipolar moment has been accompanied by the rise of Asia, particularly the increasing role of China as a major international actor. This era is also defined by unprecedented technological advancement and a knowledge revolution that has opened new horizons for development across multiple fields.