Which major country was not part of the League of Nations initially?

The United States was not part of the League of Nations initially, and this absence had significant implications for the organization’s effectiveness. The League of Nations was established after World War I with the aim of promoting peace and cooperation among countries. However, the League was created under the Treaty of Versailles, which aimed to impose terms on the Central Powers, particularly Germany.

The U.S. Senate ultimately rejected participation in the League, primarily due to concerns about entangling alliances and the loss of congressional power to declare war. This decision left a notable gap in the League’s structure because the United States was a major world power at the time, and its absence weakened the League’s authority and capabilities. This lack of American support contributed to the League's inability to effectively prevent aggression from nations like Japan and Italy in the 1930s.

Countries like Germany, France, and Italy were involved in the League from the start, with Germany being a significant player after it was allowed to join in 1926 until Adolf Hitler withdrew the country in 1933. France, one of the founding members and a victor in World War I, held a crucial role in the League, while Italy was also a member the whole time. Thus, the absence of the United States