This issue asks questions about the future of today's borders in a period of globalization and the end of bipolarization. In this new situation we are witnessing the unprecedented formation of huge regional and subregional groupings on an intercontinental scale. This allows us to glimpse the sketch plan for building a multipolar world, to compete with a world dominated by American power, against which continents and subcontinents are starting to unite to reformulate new rules of exchange. They present themselves as surprise competitors for the human masses they represent, Central and South America, India, Asia, Africa …. The borders that traditionally separated states according to dividing lines that were stable and clearly identifiable have suddenly started to become porous and act in accordance with a new and complex logic we need to redefine.