The United States was one of the countries that signed the Treaty of Versailles, but it never ratified it. This was due in part to the opposition of President Woodrow Wilson, who felt that the treaty was too harsh on Germany. Wilson also believed that the treaty would make it difficult for the United States to maintain its neutrality in future conflicts.
The United States did eventually join the League of Nations, which was created by the Treaty of Versailles to promote international peace and cooperation. However, the United States never became a full member of the League, and it never ratified the treaty that created it.
There are a number of arguments for and against the United States ratifying the Treaty of Versailles. Some historians believe that the treaty was too harsh on Germany and that it contributed to the rise of Adolf Hitler and the Nazi Party. Others believe that the treaty was necessary to prevent Germany from starting another war.
Ultimately, the decision of whether or not the United States should have ratified the Treaty of Versailles is a complex one. There are valid arguments on both sides of the issue.