In just a few hours, polls will close in what is being called the most consequential election in US history. With pre-polling showing the race is too close to call, it is not known whether the result will immediately be known, with some analysts saying it could take days for a winner to be declared. Reporter and live blogger Helen Sullivan tells Nour Haydar how she plans to navigate the results – and what to look out for as the count begins You can support the Guardian at theguardian.com/fullstorysupport