to-1937-German-Empire-in-its-borders-at-the-respective-points-of-time-193839-territory-of-31121937-Ab-1949-Federal-Republic-of-Germany-former-federal-territory-in-the-territory-until-3101990--1949-to-1956-Territory-of-the-Federal-Republic-of-Germany-without-Saarland-and-Berlin--since-1957-Federal-territory-including-Saarland-and-Berlin--since-1991-Germany-in-ist-borders-of-3101990