Australia) and New World (The Americas). Mackinder argued that whoever controlled the Heartland would have control of the world. He used these ideas to politically influence events such as the Treaty of Versailles, where buffer states were created between the USSR and Germany, to prevent either of them controlling the Heartland. At the same time, Ratzel was creating a theory of states based around the concepts of Lebensraum and Social Darwinism. He argued that states were analogous to 'organisms' that needed sufficient room in which to live. Both of these writers created the idea of a political and geographical science, with an objective view of the world. Prior to World War II political geography was concerned largely with these issues of global power struggles and influencing state policy, and the above theories were taken on board by German geopoliticians (see Geopolitik) such as Karl Haushofer who - perhaps inadvertently - greatly influenced Nazi political theory, which was a form of politics seen to be legitimated by such 'scientific' theories. The close association with environmental determinism and the freezing of political boundaries during the Cold War led to a significant decline in the perceived importance of political geography, which was described by Brian Berry in 1968 as a 'moribund backwater'. Although at this time in most other areas of human geography new approaches, including quantitative spatial science, behavioural studies, and structural Marxism, were invigorating academic research these were largely ignored by political geographers whose main point of reference remained the regional approach. As a result, most of the political geography texts produced during this period were descriptive, and it was not until 1976 that Richard Muir could argue that political geography was no longer a dead duck, but could in fact be a phoenix. Areas of study From the late-1970s onwards, political geography has undergone a renaissance, and could fairly be described as one of the most dynamic of the sub-disciplines today. The revival was underpinned by the launch of the journal Political Geography Quarterly (and its expansion to bi-monthly production as Political Geography). In part this growth has been associated with the adoption by political geographers of the approaches taken up earlier in other areas of human geography, for example, Ron J. Johnston's (1979) work on electoral geography relied heavily on the adoption of quantitative spatial science, Robert Sack's (1986) work on territoriality was based on the behavioural approach, Henry