Professor Luis Manuel Marcano Salazar addresses with theoretical and conceptual soundness issues such as the recognition of states and governments, the unilateral acts of states creating international obligations, to refer only part of his magnificent work. The analysis that the author formulates on these topics is clear and methodologically consistent, which allows the reader to accurately understand the institutions and their operation in any scenario in which contemporary International Public Law is involved. Humberto Briceño LeónProfessor of the Faculty of Juridical and Political Sciences.Central University of Venezuela.Visiting Scholar, Lewis & Clark Law School.