I think you ought to read NAFTA and some of the agreements the US has signed with the OAS and the Summit of the Americas. The United States has made many promises to latin america and Mexico that infringe on the sovereignty of this nation and our citizens.
Because the last trade agreement signed with Australia (AAFTA) says that the trade agreement requires the US obey ILO (the United Nations International Labor Organization) laws, its not out of the question that this agreement could be used to enforce action against the United States internationally.