Ameliorate Barrio Boy

Directions: students should improve, or ameliorate, the following sentence, in red. There is a missing colon and two missing commas.

Miss Hopley and her teachers never let us forget why we were at Lincoln for those who were alien to become good Americans; for those who were so born to accept the rest of us. 

suggested answer: 
Miss Hopley and her teachers never let us forget why we were at Lincoln: for those who were alien, to become good Americans; for those who were so born, to accept the rest of us.