Master of All Timelines

Your name is Edward Richardson. You're 20 and you've been fascinated by history ever since you're 11. You're also good at making inventions as well. As you're growing up, you usually found that at various points in history of each country, things always turned ugly at many points. And you wanted to change that. You decided to use your intelligence you create the device called the T.O.S, abbreviated for Timeline Opener and Stopper, that can make you travel back in time and alter the histories and even stopping time itself. And to ensure your success of your missions, you also created the hypnotizing device called the Hypnotizer.

With these two devices, you can alter the courses of histories or even creating the new timelines. And with so many points in histories to alter, who you should visit first to make your first mark in altering the world's history?