Visa is NOT required for US or Canadian citizens to enter Argentina. However, the Argentina government has a new rule according to which every student must pay online a fee of US$160 about 5-10 days prior to leaving the USA and this is solely the responsibility of the student. You must print out the receipt and produce the receipt at the entry point. Therefore, please do not lose the receipt. Your acceptance package also will have all the information about this fee. European passport holders are not required to pay this fee. Everyone must have a passport that is valid for the duration of your stay in Argentina and return. If the immigration authorities ask you for the purpose of your visit, please remember to say that you are going to the university to take some informal Spanish courses.
Argentina program DO NOT accept married students for lack of accommodation.