Final answer:
William Borah and Hiram Johnson were senators who opposed the League of Nations, fearing it would compromise U.S. sovereignty and entangle the nation in foreign wars.
Step-by-step explanation:
Senators William Borah and Hiram Johnson were indeed against the League of Nations. As leading figures of the 'Irreconcilables,' a group of senators who opposed the Treaty of Versailles and the League of Nations after World War I, they were concerned that League membership would entangle the U.S. in foreign conflicts and diminish national sovereignty. The League of Nations was an international organization proposed by President Woodrow Wilson in his Fourteen Points speech intended to prevent future wars through collective security and diplomatic negotiations. However, due to opposition from senators like Borah and Johnson, the United States never joined the League.