States of Germany
During the Allied occupation of Germany after World War II, internal borders were redrawn by the Allied military governments. No single state comprised more than 30% of either population or territory; this was intended to prevent any one state from being as dominant within Germany as Prussia had been in the past. Initially, only seven of the pre-War states remained: Baden (in part), Bavaria (reduced in size), Bremen, Hamburg, Hesse (enlarged), Saxony, and Thuringia. The states with hyphenated names, such as Rhineland-Palatinate, North Rhine-Westphalia, and Saxony-Anhalt, owed their existence to the occupation powers and were created out of mergers of former Prussian provinces and smaller states. Former German territory that lie east of the Oder-Neisse Line fell under either Polish or Soviet administration but attempts were made at least symbolically not to abandon sovereignty well into the 1960s. However, no attempts were made to establish new states in these territories as they lay outside the jurisdiction of West Germany at that time.

Q: No single state comprised of how much of the population after World War II?
30%