USA HISTORY

Detailed explanation-1: -After some notable successes and some early failures in the 1920s, the League ultimately proved incapable of preventing aggression by the Axis powers in the 1930s. The credibility of the organization was weakened by the fact that the United States never joined, and Japan, Italy, Germany and Spain quit.

Detailed explanation-2: -Despite formulating the concept and signing the Covenant, the United States never joined the League of Nations, and some relatively-isolated sovereign states in Asia also did not join, including Saudi Arabia, Yemen, Mongolia, Nepal, and Bhutan.

Detailed explanation-3: -The United States never joined the League. Most historians hold that the League operated much less effectively without U.S. participation than it would have otherwise. However, even while rejecting membership, the Republican Presidents of the period, and their foreign policy architects, agreed with many of its goals.

Detailed explanation-4: -The failures of the League in the 1930s were not only because of aggressor nations undermining its authority, but also down to its own members. Britain and France, the two most influential members, ignored the League in their efforts to appease Hitler-actions that arguably led to the outbreak of the Second World War.

Detailed explanation-5: -Congress did not ratify the treaty, and the United States refused to take part in the League of Nations.