https://www.foreigncredits.com/Resources/GPA-Calculator/Argentina suggests that 8.00-8.99 in Argentine high school grading would be like A- in the US. So 8.7 would probably be seen like 3.8 or so in the US.
International student undergraduate admissions at US universities are generally more selective than for US domestic students. And the Ivy League schools and most of the others in your list are extremely selective even for US domestic students.