This is very nicely written. Here are some problems I found with it though.
Second Sentence-On shouldn't be capitalized.
Second Sentence-Possibly try this: "...because he was a person of color."
Sixth Sentence: "...that whenever someone tries to break down the barrier of segregation, they get stopped and punished for it." Possibly try " that whenever someone tries to break down the barrier of segregation, they are stopped and punished."
I am not expert editor, but that's what I found. I really hope this helps :)