If Biden loses to Trump it will be remembered as the last free and fair election in US history.
It will not be that. Everyone said the same thing about 2016. If Trump actually successfully manages to turn the country into a dictatorship I will consider leaving this forum forever.
He wants to invoke the Insurrection Act on day one against 'dissidents'. He's planning to stack his administration with people who actively want to subvert democracy and is planning to essentially fire most of the civil service so loyalists can be installed.
If Trump wins, there will not be free elections in the US ever again. There will be election-type events, but they will play out exactly like Russia's.