This book analyses the concept of language allegiances, and, more broadly, language-based identities in a multilingual society such as the US. The guiding theme of the chapters that comprise this volume is the identification of specific beliefs and attitudes towards language, and how these lead to particular actions in the spheres of language ideology, legal litigation, educational agendas, political strategies and cultural identities. The authors share the idea that, whether it is based on reality or a perception of reality, there is a privileged connection between language and identity.