Britannica Sources used in this answer

How did the League of Nations respond to the Chaco War?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Delegates in formal attire seated closely together at an international League of Nations conference, circa 1930. — League of Nations Delegates attending a League of Nations meeting, c. 1930.

The League of Nations attempted to intervene in the Chaco War between Bolivia and Paraguay, which lasted from 1932 to 1935. Despite its efforts, the League’s Council was ultimately unable to settle the conflict.1

While the League successfully mediated other regional disputes during this period—such as ending hostilities between Colombia and Peru in 1934—it could not bring the Chaco War to a close. The conflict was eventually resolved through the Chaco Peace Conference, an inter-American arbitration effort that included Argentina, Brazil, Chile, Peru, Uruguay, and the United States. A peace treaty was signed in Buenos Aires on July 21, 1938, which awarded most of the disputed territory to Paraguay.123