An expository essay is one where you expose something, where you review a topic and expose how it works, what influences it, etc… Like an essay, it should contain:
But before you can do that you must make sure that topic can be fully covered in the span of your assignment.
Before you settle on a topic for your paper, you should try and pick three or four potential topics that are of interest to you. You should then conduct some preliminary research to see what material is available out there and to see which of your potential topics is most supported by academic research. When picking a potential topic you can conduct a preliminary search quickly, and save yourself from many mishaps. And to do it, you do not even need to visit the library; you can do it from the comfort of your home computer so long as you have an internet connection.
Start out by selecting one topic at a time and conducting a basic computer search. Look over the types of sources which are available. If you see that the topic has twenty five web pages, but all of them are blogs and the topic has no support from books or scholarly articles, then you may need to find another topic because your teacher will require a variety of scholarly sources. So do not pick a topic that does not have any support in articles or books.
When you conduct a preliminary search on your potential topics, you want to make sure that all of the magazine articles, books, or journal entries which you come across are available at your local library. Just because you found them online does not mean you can access a full text document. You might be able to download the content online for free, or your school library might have a subscription, but if not, you might need to find another source. You might find that all of the available journal articles pertain to cases in another country, which might not work for your argument based in America. You might also find that the publications are in a foreign language which you do not speak.
Overall, it is good to take some time at the beginning to make sure the topic you select is a good one. The last thing you want is to invest far too much time and effort into a project only to have it end in frustration and a new topic.