NATO was expressly designed as a workaround of the newly-formed United Nations. The UN was supposed to help facilitate diplomacy, prevent conflicts like the world wars, but the UN gave communist and ‘third world’ countries the right to speak/vote. NATO didn’t have that ‘problem.’
Canada was adamant about the need to construct such an alternate, in part because it sought to cement the bond between its two key allies, Britain and the United States, which had different views on his best to manage the rest of the world. (Classic colonialism vs neoimperialism)