Which nation's legislature refused to join the League of Nations?

a. Great Britain

b. France

c. Italy

d. United States

United States was the nation whose legislature refused to join the League of Nations. The correct option among all the options given in the question is option "d". The League of Nations was actually created for maintaining world peace after the world was devastated by World War I. Although United States of America under President Theodore Roosevelt was one of the figures that wanted this League of Nations to happen, but United States did not join it as its Constitution did not permit. There were several other reasons that led to United States not joining the League of Nations.