The main objection in the U.S. Senate to the ratification of the Treaty of Versailles was the inclusion of the League of Nations, an international organization designed to promote cooperation and resolve conflicts between nations. Many Senators opposed the League of Nations because they believed it would limit U.S. sovereignty and that the U.S. Constitution did not give the federal government the power to join such an organization. Some Senators also believed that the Treaty of Versailles was too harsh on Germany, and that it would be difficult for the U.S. to enforce the terms of the treaty without committing significant resources. Ultimately, the Senate voted against ratifying the Treaty of Versailles, and the U.S. never joined the League of Nations.