Final answer:
The League of Nations did not successfully maintain international peace and was ineffective in preventing conflicts, as evidenced by the outbreak of World War II and the withdrawal of several aggressive powers from the League.
Step-by-step explanation:
The statement that the League of Nations successfully maintained international peace until its dissolution in 1946, with no wars, is false. The League was founded after World War I to promote global security and prevent future wars through collective actions of its member nations. However, it failed to prevent several conflicts, most notably it could not stop the aggression that led to World War II. Notable aggressor states like Japan, Germany, and Italy withdrew from the League before the outbreak of the second global conflict. Although the League was based on the principle of collective security, where an attack against one member state would be considered an attack against all, this approach did not prove effective in practice. The League's inability to enforce its mandates without the participation and support of all major powers, including the absent United States, rendered it largely ineffective.