Answer:
Woodrow Wilson and his opponents refused to compromise on the wording of the Treaty of Versailles.
Step-by-step explanation:
One of the most important weaknesses of the League of Nations was the fact that many countries never joined, with the notable example of the United States. Although President Woodrow Wilson had been instrumental in the establishment of the League, him and his opponents refused to compromise on the wording of the Treaty of Versailles. It is hard to say whether the inclusion of the United States in the League would have made any significant difference in terms of its success.