The purpose of an essay is determined by your goal as a writer, as well as your subject matter.
The 1920s in the United States, called “roaring” because of the exuberant, freewheeling popular culture of the decade. The Roaring Twenties was a time when many people defied Prohibition, indulged in new styles of dancing and dressing, and rejected many traditional moral standards.
I can help, but I will not write the whole thing for you. What is the topic on?
This sentence places the object before the verb.