With America reeling from violent social unrest and the Administration's disastrous response to coronavirus, the Presidential election on Tuesday November 3 is arguably the most important in history. Here we look back over our coverage of the last 4 years - from the scientific backlash which followed soon after Trump's election in 2016, Russia's targeting of US democracy via hacking and social media, rejection of the Paris Agreement on Climate Change, through to the Doomsday Clock ticking closer to midnight and breaches of security protocols at the White House.