Arc of the Medicine Line: Mapping the World's Longest Undefended Border across the Western Plains

Today the borderland between Canada and the United States is a wide, empty sweep of wheat fields and pasture, measured by a grid of gravel roads that sees little traffic and few people who do not make their lives there. It has been much this way for more than a century now, but there was a moment when the great silence shrouding this place was broken, and that moment changed it forever. Arc of the Medicine Line is a compelling narrative of that moment—the completion of the official bo…