You should really direct this to the admissions department at UT/A. They can give you some good ideas of how to spin your application packet. You'll also get brownie points for personal initiative, and you'll have a friend or two on the admissions committee.
That's an entire essay question; where do you need *help*?
Have you read the assignment on the 2nd Great Awakening? If so, where are you having trouble connecting it to the subsequent reform movements?