 Thus, the Prussian government regarded the Rhinelands as more of a colony, furnishing the bureaucracy, which was based in Düsseldorf, with civil servants that were drafted in from other regions of Prussia.Mettmann was liberated from the National Socialist Dictatorship April 16th, 1945 by a vanguard of the US Ninth Army and then became a part of the British military administration under which the Northern Rhineland was redemocratised.Since 1946, Mettmann is a part of the Land North Rhine-Westphalia and from 1949 of West Germany.