One of the best ways to prepare for the DBQ (the "document-based question" on the AP European History, AP US History, and AP World History exams) is to look over sample questions and example essays. Doing this will help you to get a sense of what makes a good (and what makes a bad) DBQ response.
That said, not all DBQ essay examples are created equal. I’ll briefly cover what makes a good DBQ example and then provide a list of example essays by course. Lastly, I’ll give you some helpful tips on how to best use sample essays in your own preparation process.