I don’t think about erasing history, but it sounds interesting. Some people can be erased from history. You need a time machine to do this in so forth. I think of my history as some positives, and some negatives. Yours is one too, as well. I think that if you can go back in time to grab someone important in that time, and send s/he from another time period. This will prevent important history from happening. Eventually, the history you took from that person will be erased from existence. As if it never happened. I remember the history of World War II so well. Can you kill Adolf Hitler when he is real young in his twenties from preventing another world war? Are you going to get caught? Yes, definitely you will, and be sent to prison. Maybe, you want to erase other important past events. One thing you might do is go through a wormhole, and stop Mario Puzo from writing The Godfather. In fact if he never wrote it, then history will be looked different. There are many things that can be erased from past’s histories. In order to do so, you need to study history, places, and people from its time. Repeat the things from past events to yourself, until you are there. Obviously, you can’t change history, because it is already written. It will affect your lifestyle, if you do. You can go back to ancient times, and prevent the Roman Empire from ruling the world. But, it will take you longer for you to do that. Whichever, time in history you want to erase, there will be challenges that you will fail trying.