I want to know the answer to the following question:
What date did Estonia join the League of Nations?
All the background I'm provided with is that "Estonia was a member of the League of Nations from 22 September 1921, has been a member of the United Nations since 17 September 1991, and of NATO since 29 March 2004, as well as the European Union since 1 May 2004.". Is that enough to answer the question?
Answer: yes