What reason did the US Senate give for opposing the US membership in the league of nations?

The US Senate opposed membership in the League of Nations primarily due to concerns about national sovereignty and the fear that it would obligate the United States to intervene in international conflicts. Senators were worried that joining the League could entangle the nation in foreign wars, undermining Congress's constitutional authority to declare war. Additionally, there was a belief that the League's collective security provisions could compromise American independence in foreign policy decisions. The debate reflected broader isolationist sentiments prevalent in the post-World War I era.