This experience instilled in me a respect for individuals of all backgrounds and the knowledge to throw away prejudgments.
did you not have this before? or did this experience only help you reinforce this or waht? i think this just needs some work.
i love the realness of your essay. you know how you say "white" then you get a little bit more proper then say "african american" later (idk thats the stuff i notice).
you do have a passive/active voice thing here:
The children that I worked with were African-American...
change this too
I worked with African-American children, some on welfare, and many who came from dysfunctional homes.
do u see the difference with the bold part? thats difference between the active and passive voice. plus itll save you a few words.
also, you didnt tackle the religion part of the african american children, but you did say they came from dysfunctional homes. i think you should leave out the christian part in the beginning and say something like "close knit families" (something wayyy less cliche though). you also say their world was VASTLY different. if you want to show how vastly different, i think you needd more than just skin color, money, and religion to show that. (in other words, consider taking out that word vastly. remember, you were supposed to have learned a "lesson" from this. not feel sorry for the "poor black kids" get it?)
i cant say anything else. i really like it. it answers the prompt. you link yourself to it professionally (by saying the anecdote about your brother) its sorta perfect in a way. gj!
good luck!