(A) US was on Council.
(B) US was just a member.
(C) ** US did not join.
(D) US joined but then left.
EXPLANATIONS BELOW
Concept note-1: -The League of Nations was established at the end of World War I as an international peacekeeping organization. Although US President Woodrow Wilson was an enthusiastic proponent of the League, the United States did not officially join the League of Nations due to opposition from isolationists in Congress.
Concept note-2: -Non-membership of the League of Nations Despite Woodrow Wilson chairing the committee which drafted the Treaty of Versailles Covenant, America voted against becoming official members of the League of Nations in 1919.
Concept note-3: -Answer and Explanation: The main impact of the United States’ rejection of the League of Nations was that the organization ultimately collapsed. Furthermore, the U.S.’s reaction to and hostility toward the League weakened it, as its inception was predicated on the United States’ involvement.