Guam

These are real dates: Guam's founding is recorded in Wikidata, and accepted here only because they agree with the centuries the atlas independently drew it in. No dissolution is recorded, so the closing year below is still the last century the atlas drew — not when it ended. The atlas itself draws the world at one moment in time, not continuously. The strip below covers those snapshots — 1938 CE to 1938 CE — which sits inside the fuller span above.