German–Polish customs war

The German–Polish customs war was a political and economic conflict between the Second Polish Republic and the Weimar Republic, which began in June 1925 (shortly after the death of German president Friedrich Ebert from SPD) and ended officially in March 1934. The conflict began when Poland's status expired as one of the Entente's most favoured nations in trade with Germany. Berlin then decided to raise customs duty, which primarily affected the Polish coal industry, Poland's main export to Germany. In return, Warsaw also raised duty on German goods. Germany's purpose in the war was to cause a breakdown of Poland's economy and gain political concessions. They included revanchist claims to Polish territories.