What action did the League take regarding the Aaland Islands in 1921?

The League of Nations intervened in the dispute over the Aaland Islands between Finland and Sweden in 1921 by ruling that the islands belonged to Finland. This decision was significant as it demonstrated the League's role in mediating international disputes and promoting peaceful resolutions rather than resorting to conflict. The ruling was based on the principle of self-determination and the fact that the majority of the inhabitants identified as Swedish but were geographically tied to Finland. By resolving the dispute in favor of Finland, the League helped to maintain peace in the region and established a precedent for its future role as an international mediator in conflicts.