Between 1898 and 1939, Spain saw the emergence of political and social identities shaped by the concepts of Hispanidad, Catholicism, race, tradition and the Spanish language. Rooted in 19th-century conservative thought, these ideas evolved through intellectual debate and ideological conflict with liberal and left-wing currents. This book explores how such identities were reshaped during Spain’s major political shifts and how they intersected with Latin American discourses. By examining both state-led initiatives and grassroots movements, it offers a dual perspective on the nationalization of the masses and the construction of Spanish and Iberian social and political identities.