People watch Spain’s World Cup semifinal soccer match against France on a giant screen, which shows Spain’s Lamine Yamal (19), at Parc Central near the Rocafonda neighborhood of Mataró, Spain, on July 14, 2026. As he prepared for the World Cup final, Yamal, 19, was at the heart of a national debate about what it means to be Spanish in an increasingly multicultural society. (María Contreras Coll/The New York Times) By JASON HOROWITZ Shortly before Spain’s soccer team won a place in the World…