The region was detached from East Prussia by the Treaty of Versailles and placed under a provisional French administration. During the staged Klaipėda Revolt of January 1923, the Lithuanians seized control of the region and attached it to Lithuania. The Conference of Ambassadors accepted this "fait accompli" and set out to formalize the territorial changes. The inhabitants of the area were not given a choice on the ballot on whether they wanted to be part of Lithuania or part of Germany. After difficult negotiations, the Convention was agreed upon in spring 1924. The region was granted extensive legislative, judicial, administrative and financial autonomy. It had its own democratically elected parliament (Klaipėda Diet) and appointed executive branch (the Klaipėda Directorate). The administration and operation of the port of Klaipėda was entrusted to a three-member Harbor Board. The Neman River, particularly its timber traffic, was internationalised, granting freedom of transit to all nations. The Convention became obsolete when the Klaipėda Region was attached to Nazi Germany as a result of the ultimatum of 1939.