This book brings together ten empirically rich and theoretically informed contributions that aim to clarify both geo-historical specificities and common transnational and global features of the cultures and practices of boundary making that shaped modern statehood. Written by scholars from Spain, France, Italy, Argentina, Brazil and Mexico, the essays included in this volume provide a comparative international perspective on the processes of border formation, as well as an integrative approach that seeks to strengthen the links between renewed geo-historical studies and more contemporary-oriented border studies. The book is addressed to a wide range of researchers, including geographers, historians, political scientists and specialists in geopolitics and the history of international relations.