even inherited from one country to another due to common history, relations between the countries, culture and even propaganda. The geostrategy of location include river valleys, inland sea, world ocean, world island, and so on. For instance, the start of Western civilization was located in the river valleys of the Nile in Egypt and the Tigris and Euphrates in Mesopotamia. The Nile and Tigris and Euphrates not only provided the fertile soil for crop production, but also allowed for the floods that taxed the ingenuity of the inhabitants. The climate of the area was conducive to an existence based primarily upon agriculture. The rivers also provided the avenues of trade in a period when muscles of man and the winds of the sky were the motive power of ships. The river valleys became a unifying factor in the political development of the people. History Precursors As early as Herodotus, observers saw strategy as heavily influenced by the geographic setting of the actors. In History, Herodotus describes a clash of civilizations between the Egyptians, Persians, Scythians, and Greeks—all of which he believed were heavily influenced by the physical geographic setting. Dietrich Heinrich von Bülow proposed a geometrical science of strategy in the 1799 The Spirit of the Modern System of War. His system predicted that the larger states would swallow the smaller ones, resulting in eleven large states. Mackubin Thomas Owens notes the similarity between von Bülow's predictions and the map of Europe after the unification of Germany and of Italy. Golden age Between 1890 and 1919 the world became a geostrategist's paradise, leading to the formulation of the classical geopolitical theories. The international system featured rising and falling great powers, many with global reach. There were no new frontiers for the great powers to explore or colonize—the entire world was divided between the empires and colonial powers. From this point forward, international politics would feature the struggles of state against state. Two strains of geopolitical thought gained prominence: an Anglo-American school, and a German school. Alfred Thayer Mahan and Halford J. Mackinder outlined the American and British conceptions of geostrategy, respectively, in their works The Problem of Asia and "The Geographical Pivot of History". Friedrich Ratzel and Rudolf Kjellén developed an organic theory of the state which laid the foundation for Germany's unique school of geostrategy. World War II The most prominent German geopolitician was General Karl Haushofer. After World