The provision of the league of nations that Henry Cabot opposed was an organization to provide collective security Harsh punishments for Germany.
Henry Cabot was an isolationist. He was one of those that were in support of the United States isolation from the events that were going on in the rest of the world like the world war.
The organization that he was opposed to was the League of nations that had been proposed by international world powers. He felt such organizations were capable of putting the sovereignty of the US at risk.
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