As you know freedom is a broad topic. There are so many directions that you can take your essay. Since you are in college, let me give you some more sophisticated suggestions.
First, you can do a comparative study between freedom in America and freedom elsewhere. Is it possible that we have freedom only in name? Think of all the cameras that video tape us, the government monitoring, the debt that enslaves us, and so much more. Can it be said that this is freedom? If not, what is freedom.
Second, another example would be to write a paper on freedom from a historical perspective. Is there more or less freedom today. How does freedom change over time and what is the fundamental definition of freedom (this is not an easy question)?
Third, if you want to go in a different direction, you can write a more patriotic paper and talk about the price or cost of freedom.