Thanks for the advices..i never thought that it would be that strenuous. The main reason I thought of this idea was because I could save more than a thousand dollars if I were to do that itinerary rather than doing a direct flight to south america. In addition, I can travel to the US after going to S AMerica. Well, I do not want to risk being denied in the United States. Thank you for the warnings.

Last year, I went to Mexico City from Los Angeles without any problem probably because Mexico is a contiguous country to the United States. However, it's a different case for argentina and brazil..