Why was the league of nations succsessful in the 1920s?

The League of Nations was considered successful in the 1920s primarily due to its role in resolving various international disputes and promoting diplomacy. It effectively mediated conflicts such as the Aaland Islands dispute between Finland and Sweden, and it oversaw the establishment of mandates in former Ottoman territories, contributing to stability. Additionally, the League made significant strides in social issues, addressing health, labor rights, and refugee crises. However, its overall effectiveness was limited by the absence of major powers like the United States and its inability to prevent aggressive actions by nations in the late 1930s.