Why was the League of Nations rejected by the United States?

The league was heavily linked to the treaty of Versailles, whilst the league was also created to support the treaty and enforce its terms, yet many Americans disliked the content of the treaty, as many were recent immigrants who had never agreed to wanting America to join the war against Germany in the first place. Some were worried about the financial cost of joining. They thought that if they signed it would be a promise to resolve international problems no matter how much this cost. Some business leaders believed that the USA had become as powerful as it had due to isolationism.