Karl Haushofer
After World War I, the thoughts of Rudolf Kjellén and Ratzel were picked up and extended by a number of German authors such as Karl Haushofer (1869–1946), Erich Obst, Hermann Lautensach and Otto Maull. In 1923, Karl Haushofer founded the "Zeitschrift für Geopolitik" (Journal for Geopolitics), which was later used in the propaganda of Nazi Germany. The key concepts of Haushofer's Geopolitik were Lebensraum, autarky, pan-regions, and organic borders. States have, Haushofer argued, an undeniable right to seek natural borders which would guarantee autarky.