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So when you watch the Tokyo Games in 2020, remember that this seeming competition between nations actually represents an astonishing global agreement. For all the national pride people feel when their delegation wins a gold medal and their flag is raised, there is far greater reason to feel pride that humankind is capable of organising such an event.

Many of these political entities appeared and disappeared within a matter of years. As you made your preparations for the 1016 Olympics, you could not know in advance which delegations would show up, because nobody could be sure which political entities would still exist next year. If the kingdom of England had sent a delegation to the 1016 Olympics, by the time the athletes came home with their medals they would have discovered that the Danes had just captured London, and that England was being absorbed into the North Sea Empire of King Cnut the Great, together with Denmark, Norway and parts of Sweden. Within another twenty years, that empire disintegrated, but thirty years later England was conquered again, by the Duke of Normandy. Needless to say, the vast majority of these ephemeral political entities had neither anthem to play nor flag to hoist.