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In March 1921, the Inter-Allied Commission held the Upper Silesia plebiscite, which was peaceful despite the previous violence. The plebiscite resulted in c. 60 per cent of the population voting for the province to remain part of Germany. Following the vote, the League of Nations debated the future of the province. In 1922, Upper Silesia was partitioned: Oppeln, in the north-west, remained with Germany while Silesia Province, in the south-east, was transferred to Poland.
Memel remained under the authority of the League of Nations, with a French military garrison, until January 1923. On 9 January 1923, Lithuanian forces invaded the territory during the Klaipėda Revolt. The French garrison withdrew, and in February the Allies agreed to attach Memel as an "autonomous territory" to Lithuania. On 8 May 1924, after negotiations between the Lithuanian Government and the Conference of Ambassadors and action by the League of Nations, the annexation of Memel was ratified. Lithuania accepted the Memel Statute, a power-sharing arrangement to protect non-Lithuanians in the territory and its autonomous status while responsibility for the territory remained with the great powers. The League of Nations mediated between the Germans and Lithuanians on a local level, helping the power-sharing arrangement last until 1939.
On 13 January 1935, 15 years after the Saar Basin had been placed under the protection of the League of Nations, a plebiscite was held to determine the future of the area. 528,105 votes were cast, with 477,119 votes (90 per cent of the ballot) in favour of union with Germany; 46,613 votes were cast for the status quo, and 2,124 votes for union with France. The region returned to German sovereignty on 1 March 1935. When the result was announced 4,100 people, including 800 refugees from Germany fled to France.In late 1918, American, Belgian, British, and French troops entered the Rhineland to enforce the armistice. Prior to the treaty, the occupation force stood at roughly 740,000 men. Following the signing of the peace treaty, the numbers drastically decreased and by 1926 the occupation force numbered only 76,000 men. As part of the 1929 negotiations that would become the Young Plan, Stresemann and Aristide Briand negotiated the early withdrawal of Allied forces from the Rhineland. On 30 June 1930, after speeches and the lowering of flags, the last troops of the Anglo-French-Belgian occupation force withdrew from Germany.
Belgium maintained an occupation force of roughly 10,000 troops throughout the initial years. This figure fell to 7,102 by 1926, and continued to fall as a result of diplomatic developments.