Medical school admissions in the US are based on two main factors: 1) GPA and 2) MCAT. Within the GPA, they will focus on your science GPA and grades on organic chemistry.
There are some US schools that will accept internationals: these are mainly the private schools. Even some state admit internationals from time to time.
Also read up on grade deflation. There are several colleges on your list known for grade deflation. This means that getting a top GPA (> 3.7) will be very difficult. Especially UChicago and JHU. These are well known for ruining many med school dreams. Brown is a good choice, because of its grading policy, and rigor.