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Answer:
The US Senate did not allow the US to become involved in the League of Nations.
The United States was unable to convince any other nations to join the league.
The reasons that explain the failure of the League of Nations are:
- The United States was unable to convince any other nations to join the league.
- The US Senate did not allow the US to become involved in the League of Nations.
Background
The League of Nations is an international organization which was set up with an aim to maintain world peace. There had to be unanimity for decisions that were taken.
Unanimity made it really hard for the League to do anything. The reason for the failure of the League is non existence of unanimity of decisions.
The nations having major powers left and they were not ready to join again.
The disapproval of US Senate from joining the League made the League suffer and fail.
Hence the correct options are C and D.
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