Spain won the World Cup on Sunday by dethroning Argentina 1-0, but the victory in New Jersey has also taken Spanish football to a level of its own. As the team returned home on Monday, with an estimated crowd of almost two million on hand to greet them through the streets of Madrid, their win added to the nation’s long list of recent triumphs across men’s, women’s and youth competitions, highlighting the dominance of a system that has stuck to a tactical identity and the development of...