Awaiting an Omen
Remus and Romulus disputed over where they should found Rome. At a point, they simply stared at the sky to await an omen to determine which was right. No omen to resolve the dispute came, and eventually, Romulus killed Remus and became ‘the’ founder. If there had been an omen, Remus might have been the founder, changing the course of Rome and consequently the world.
Story credit: Reddit / GiantBabyHead