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Because they are not equal. The UN is a forum where countries can communicate but it holds no power/money and relies on member states. The US pays a lot more than Equatorial Guinea abd welds more power. They US and other powerful nations sit on the security council and can veto any vote that come up there. The general assembly vote is non-binding so anyone can ignore it.

The UN was setup to prevent world war III not police the injustices

The UN doesn't actually have any power