It is centuries after the war that left only a few tribes to wander the land of Tizathy. They include the Sippies (Mississippians), the Zurries (Missourians), and a people who don't speak English but who accommodate a group of traveling explorers hospitably and wave goodbye while saying, "Veedzayn! Oh veedzayn!" (Auf wiedersehen; evidently they have passed through Lancaster County, Pennsylvania). Our explorers are led by a literate woman; she is proud to have a mate who can read. As they roam the canyon-like streets of a nearly deserted city, whose natives have directed them to a large building called Slukes, he reads a sign and corrects the pronunciation to Stlukes (St. Lukes Hospital). Inside, they encounter a strange glass pear (light bulb) that breaks in the hand. It is all so mysterious. The natives of this still imposing city show them the goddess Salibbidy (Goddess of Liberty) in the harbor.
If you're still wondering how the United States became Tizathy, hum to yourself, "My country, 'tis of thee..." The story is full of linguistic humor. Written in English, published in an anthology by the 60s or 70s.