whatever the case if they accepted your application then you must be qualified. un less there has been a misrepresentation
Right on the application page, it states:
To be considered for the Yahoo! Publisher Network beta program, please enter your information below. Participants of the program must have a valid U.S. Social Security or Tax ID number, and web site content that is predominantly in English and targeted at a U.S. user base.
So if you have applied, you have agreed to the above statement on the application form. So if YPN accepts the application, they are doing so because you have agreed you met the requirements, although you clearly did not. The misrepresentation was not on the part of YPN.