- The office of the US president was established in 1789
- 45 people (all men) have held office in the 231 years since the first man was elected
- Since then only 10 people have failed to win re-election for the second term
- If Donald Trump loses then he becomes the 11th man to fail to win re-election
- If Trump refuses to concede then he will be the first incumbent to refuse to hand over power after an electoral defeat
