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How did the League of Nations settle the Upper Silesia border dispute?

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Delegates in formal attire seated closely together at an international League of Nations conference, circa 1930. — League of Nations Delegates attending a League of Nations meeting, c. 1930.

The League of Nations resolved the Upper Silesia border dispute by employing a new, effective technique that combined political and economic dispositions based on the advice of its technical organizations.1

After the Allied Supreme Council failed to reach a unanimous decision regarding the division of the region following a 1921 plebiscite and subsequent armed uprisings, the matter was referred to the League’s Council. The League’s resulting compromise, accepted by the Allied powers on October 20, 1921, partitioned the territory. While Germany retained the majority of the land and population, Poland was awarded approximately 1,300 square miles of territory, which included two-thirds of the region's steelworks and three-quarters of its coal-producing area. This settlement is considered one of the League's significant political achievements during its early years.21