Arizona...when AP called it, not Fox.
Same here, and I'm surprised more posters haven't mentioned this. I knew Trump had lost the election as soon as Fox called Arizona. I simply could not see Trump winning any of the Big 3 Rust Belt states that got him to victory in 2016 after losing Arizona. Sure, it took a few days for Pennsylvania, Georgia, and Nevada to be officially called, and I did think that Trump would narrowly hold Georgia by possibly a few thousands (maybe even a few hundred) votes, but as soon as Trump lost Arizona, I knew Biden would be the 46th President, whether it was called 11/5, 11/8 or any other date.