International relations (IR) is the study of relationships among countries, the roles of sovereign states, inter-governmental organizations (IGO), international non-governmental organizations (INGO), non-governmental organizations (NGO), and multinational corporations (MNC). International relations is an academic and a public policy field, and so can be positive and normative, because it analyzes and formulates the foreign policy of a given State. As political activity, international relations dates from the time of the Greek historian Thucydides (ca. 460–395 BC), and, in the early 20th century, became a discrete academic field (No. 5901 in the 4-digit UNESCO Nomenclature) within political science. However, International Relations is an interdisciplinary field of study.
Besides political science, the field of International Relations draws intellectual materials from the fields technology and engineering, economics, history, and international law, philosophy, geography, and social work, sociology, anthropology, and criminology, psychology and gender studies, cultural studies and culturology. The scope of International Relations comprehends globalization, state sovereignty, and international security, ecological sustainability, nuclear proliferation, and nationalism, economic development and global finance, terrorism and organized crime, human security, foreign interventionism, and human rights.
Political geography is the field of human geography that is concerned with the study of both the spatially uneven outcomes of political processes and the ways in which political processes are themselves affected by spatial structures. Conventionally political geography adopts a three-scale structure for the purposes of analysis with the study of the state at the centre, above this is the study of international relations (or geopolitics), and below it is the study of localities. The primary concerns of the sub-discipline can be summarised as the inter-relationships between people, state, and territory.
"Political geography in essence builds a country economy" The origins of political geography lie in the origins of human geography itself and the early practitioners were concerned mainly with the military and political consequences of the relationships between physical geography, state territories, and state power. In particular there was a close association with regional geography, with its focus on the unique characteristics of regions, and environmental determinism with its emphasis on the influence of the physical environment on human activities. This association found expression in the work of the German geographer Friedrich Ratzel who, in 1897 in his book Politische Geographie, developed the concept of Lebensraum (living space) which explicitly linked the cultural growth of a nation with territorial expansion, and which was later used to provide academic legitimation for the imperialist expansion of the German Third Reich in the 1930s.