This book examines the link between constitutional asymmetry and multinationalism and the effects asymmetry produces on legitimacy and stability in federal and quasi-federal systems. This is done through a structured and exhaustive comparative analysis, covering states in Africa, America, Asia, and Europe. Contrary to traditional federal theory, contemporary scholars have linked constitutional asymmetry with multinational federal systems, by presenting asymmetry as a mechanism for diversity management. This book offers insights on whether and how constitutional asymmetry is linked with multinationalism and looks into the socio-economic, cultural-ideological, historical, and separatist factors that support the emergence of asymmetries. The work also provides a legal analysis of whether constitutional asymmetry is a condition or a threat to legitimacy and stability in federal systems. The book will be essential reading for academics, researchers, and policy-makers in law and political science interested in the fields of constitutional law, federal theory, multinationalism, and minorities.