What was the outcome of the Vilna incident in 1920?

The outcome of the Vilna incident in 1920 is correctly identified as Poland invading Lithuania without League intervention. This conflict arose shortly after World War I when both countries claimed Vilna (Vilnius) as their capital. In an effort to assert its independence, Lithuania declared sovereignty, but Poland, seeking to expand its territory and influence, occupied the region militarily.

The importance of this event lies in the response (or lack thereof) from the League of Nations, which was established to maintain peace and resolve international conflicts. The League's failure to intervene effectively demonstrated its weaknesses and limited capacity to enforce peace in the immediate post-war period, leaving Poland free to solidify its control over Vilna without facing any significant consequences. This incident highlighted the political tensions in Eastern Europe and set a precedent for future territorial disputes.

Overall, the Vilna incident illustrates the complexities of national boundaries and sovereign claims in the aftermath of World War I, as well as the challenges faced by international bodies in handling such disputes.