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Explanation:
Woodrow Wilson, during his presidency from 1913 to 1921, was a prominent advocate for progressive reforms. However, one significant reform he was unable to successfully establish was the League of Nations. The League of Nations was a precursor to the United Nations, aimed at promoting international cooperation and maintaining world peace after World War I. Despite Wilson's efforts to establish the League and his involvement in negotiating the Treaty of Versailles, which included provisions for the League, the United States Senate ultimately rejected U.S. participation in the League of Nations. The Senate's refusal to ratify the Treaty of Versailles and join the League was a major setback for Wilson and his vision of global peace and cooperation.
