The population of the Free City of Danzig was strongly in favour of annexation by Germany, as were many of the ethnic German inhabitants of the Polish territory that separated the German exclave of East Prussia from the rest of the Reich. The Polish Corridor constituted land long disputed by Poland and Germany, and was inhabited by a Polish majority. The Corridor had become a part of Poland after the Treaty of Versailles. Many Germans also wanted the urban port city of Danzig and its environs (comprising the Free City of Danzig) to be reincorporated into Germany. Danzig city had a German majority, and had been separated from Germany after Versailles and made into the nominally independent Free City. Hitler sought to use this as "casus belli", a reason for war, reverse the post-1918 territorial losses, and on many occasions had appealed to German nationalism, promising to "liberate" the German minority still in the Corridor, as well as Danzig.