The center of Skopje, the capital of North Macedonia, a Balkan country born just 33 years ago as an independent state, is awash in history. A statue of Alexander the Great looms over the central square. One of his father, Philip II of Macedon, towers above a nearby piazza atop an oversize pedestal. The city is also littered with tributes in bronze, stone and plaster to generations of other heroes from what the country sees as its glorious and very long history. The problem, though, is that most of the history on display is claimed by other countries. Present-day North...