This account of political geography shows how it coemerged with modern geography in the era of interimperial rivalries (1870–1945) within a longer historical perspective. Geography was then a unitary, synthetic form of knowledge, encompassing the natural world and human history. Although Darwinian notions of struggle for survival applied to world politics influenced the naturalized ideas of pioneers of political geography such as Ratzel and Mackinder and, to different degrees, French and American geography, all these national traditions evolved differently in the interwar period. While the field was temporarily eclipsed after World War II, its Cold War revival shifted political geography's focus from environmental determinism to the relationship between power and knowledge, and later that between power and representations. Contemporary geopolitics points to a continued need for effective planetary governance, and the cultural changes it may require ask for greater imagination based in historical understanding.