In which year did the League of Nations intervene in the conflict over Upper Silesia?

The League of Nations intervened in the conflict over Upper Silesia in 1921. The region was a source of contention between Germany and Poland following World War I, as both countries sought control over its resources and strategic significance. The League's involvement was crucial in managing the dispute, demonstrating its role in international diplomacy during the interwar years.

In 1921, the League organized a plebiscite to allow the local population to choose which country they wanted to join. The result was split, leading to further tensions. To resolve the issues that arose after the plebiscite, the League intervened again by partitioning the area, giving part of Upper Silesia to Poland and retaining the industrialized areas for Germany. This moment marked an important instance of the League attempting to mediate conflicts and maintain peace in Europe after the devastation of World War I.