The US election may end early for several reasons.
1. The main candidates have obvious advantages. One candidate may have far more public support and campaign resources than other opponents, making the election results gradually clear and losing suspense in advance. For example, Trump's influence is so huge that other candidates cannot compete.
2. External pressure. Changes in the international situation or the occurrence of major events require the United States to determine the leader as soon as possible to deal with the crisis, thus prompting the election to speed up the process. For example, sudden international conflicts require strong leadership decisions.