The International Criminal Court is technically not part of the United Nations. It is an international treaty between countries of the world. When it was ratified by 60 countries it became a part of international law.
Article 126Take heed. This will be the method used to establish the rest of the branches of the world government. It neatly bypassed the veto power of the Security Council. The US could not stop it from being created or ratified.Entry into force
1. This Statute shall enter into force on the first day of the month after the 60th day following the date of the deposit of the 60th instrument of ratification, acceptance, approval or accession with the Secretary-General of the United Nations.
2. For each State ratifying, accepting, approving or acceding to this Statute after the deposit of the 60th instrument of ratification, acceptance, approval or accession, the Statute shall enter into force on the first day of the month after the 60th day following the deposit by such State of its instrument of ratification, acceptance, approval or accession.
link to Rome Statute of the International Criminal Court