Comment by DrSiemer

Europe is full of people who are not fans, but will still hear all about the games when their country plays, because it's basically impossible to avoid. Chat groups, work banter, waiting rooms, everybody will be talking about it ALL THE TIME. There is a base level of knowledge for the sport everybody shares. Maybe it's the same with American Football in the US? As a European, I still have no idea what that is even remotely about.

A game having two main uninterrupted halves is one of those foundational facts. Players train for being able to play for that long without getting too thirsty to continue.