Polish Corridor
The corridor was used to secure  Poland's access to the Baltic Sea. This is based on U.S. President Woodrow Wilson's proposal in his famous Fourteen Points speech at the start of 1918. The German-majority city of Danzig was not a part of the Polish Corridor but was instead made a free city under League of Nations rule. Weimar Germany's various governments did not accept the new German-Polish border as being permanent and hoped to change this border later on through negotiations.