This volume presents a research-led, interdisciplinary examination of existing scholarship as well as new research on twentieth-century newspaper and periodical history across Britain and Ireland during a key period of change and development into the twenty-first century. It covers an important period of expansion (1900-2017) in periodical and press history across the four nations of Britain (England, Northern Ireland, Scotland, Wales) and Ireland, concentrating on how the development of twentieth-century print communication can be assessed via cross-border comparisons and contrasts. Its thirty-three chapters are interspersed with case studies specific to the themes covered, allowing synchronic and diachronic coverage via macro as well as micro studies. It is designed to provide readers with a clear survey of the current state of research in the field, drawing on contemporary methodologies, demonstrating the interdisciplinary nature of the field and offering an indication of areas ripe for further work. The impact on the field of digital media and archives will fully inform discussions of the print archive where relevant. While the volume meets a need amongst scholars of British and Irish culture, it will also be of tremendous value to those working in other national traditions, offering insight into press trade connections into European and trans-oceanic counterparts, highlighting matters related to national and trans-national identities, migration, skills and knowledge exchange and the place of such texts in a globalised marketplace.