United states senators who opposed the treaty of versailles mainly objected to

the United States membership in the League of Nations

Explanation: The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers and was signed in 28 June 1919.

The treaty was signed by representatives of each country in June 1919. For the U.S. to accept its conditions, however, it had to be ratified by Congress. Senate Majority Leader Henry Cabot Lodge, a Republican from Massachusetts, opposed the treaty, specifically the section regarding the League of Nations. Senator Lodge argued that the U.S. was giving up too much power under the League of Nations and the Senate voted to reject the treaty.

Ultimately, in place of the Treaty of Versailles, Congress passed a resolution, known as the Knox–Porter Resolution, in 1921 to formally end the war with Germany.

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