The April League Crisis was an event which started on April 20 1939. The Secretary-General of the League said that "Any member state which gets involved in this war will be expelled". This shocked many countries, and over the next ten days, over half the original members left the League.
- 20 - The Secretary-General makes the original announcement
- Argentina - "We, the Argentine Nation are shocked by the lack of freedom in the League of Nations, and as such, we are know leaving the League"