Before revision: Pan-regions contributed to Geopolitik or the German theories of foreign policy during the interwar period (1918–1939) or the time from the end of World War I and the beginning of World War II.
After revision: Pan-regions contributed to Geopolitic or the German theories of foreign policy during the interwar period (1918–1939) or the time from the end of World War I and the beginning of World War II.