Also should be worth mentioning that Argentina is not part of the visa waiver program. That means that if you want to come to the US for 1-3 months, you'll have to apply for a visa, and immigration authorities will almost certainly want proof that you will have enough money to live as a tourist in the USA for that period of time. So you need to make sure to have the money in advance and be able to prove it. It would be unfortunate if you spent money on a plane ticket to the US only to get turned down and forced to return immediately.

Have you considered applying for a "study abroad" program in the US? If you get accepted, then you will be able to work limited hours on-campus (and potentially off-campus as part of your studies).

You're right, all my life I followed the legal path and I have the intention to keep on it :).

Also, inmigration authorities could get this thread and negate/cancel your visa for ever.