alt Hacker NewsCUSMA is just a trade deal, not a full-on organization like the EU.
If we're doing a trade deal measuring contest, I will just point out that the EU has the world's largest free trade network, including Canada (already), South Korea, most of Latin America, India etc etc.
NATO is an organisation and people want to join it - and it has more countries than the EU.
Let me guess: NATO doesn't count because...
Sorry, the EU does not have any special mythical status that does not apply to other organisations, unless you want to play word games so it's the only one that even qualifies.