ST. LOUIS (AP) — A walk down the 6-mile city street named for the Rev. Martin Luther King Jr. yields plenty of images that would surely unsettle the civil rights leader: shuttered storefronts, open-air drug markets and a glut of pawn shops, quickie check-cashing providers and liquor stores.

The urban decay along Dr. Martin Luther King Jr. Drive in St. Louis can be found in other major American cities, from Houston and Milwaukee to the nation’s capital.

“It’s a national problem,” said Melvin White, a 46-year-old postal worker in St. Louis and founder of a 3-year-old nonprofit group that is trying to restore King’s legacy on asphalt. “Dr. King would be turning over in his grave.”

Nearly three decades into the observance of Monday’s federal holiday, the continuing decline of the most visible symbols of King’s work has White and others calling for a renewed commitment to the more…