A version of this story appears in CNN’s What Matters newsletter. To get it in your inbox, sign up for free here . CNN  —  Who, what, when and where? It can be valuable to take a step back from the day-to-day news and look with a wider lens at the election playing out. Here are answers to some more general questions that can get lost at the end of the campaign. When is Election Day? US law requires a presidential election every four years. These general elections, since 1845, are required to