For most colleges, this will count against you, including Wharton. Only Harvard, Yale, Princeton, MIT, and Amherst College are need-blind for international students. That means that they will likely prefer a student who will be able to pay, even if they are not as good as you.
While you say that your school does not rank - do you know where you stand, more or less? Top 1%? Top 5%? Top 10%? This is important, since you will be compared to students from your country.
Also - recalculate your GPA to a 4.0 scale, since that is what OAs will be doing.
As a rule, admissions for international students who require financial aid to the most popular colleges are extremely low - we鈥檙e talking 1%-3%, as opposed to 4%-8% for USA citizens. Your chances will be lower for any need-aware college.
It will still be worth your while, but assume that it won鈥檛 work out. So make sure that you have alternative plans in your own country or in Argentina.
What can your family afford?