For residents living at national borders, the divisions between countries are rarely black and white, and often everyday interactions contribute to the creation of a cross-border region. This book examines this phenomenon in Cascadia, which runs along the Canada/US border in the Pacific Northwest.Placing people at the heart of the analysis, the book considers the everyday interactions and links which bind residents together and help to define Cascadia as a cross-border region. The book also assesses the impact that increased border security in the wake of 9/11 has had on border residents. Following a bottom-up approach rather than a top-down approach, the book examines how border security impacts the residents’ mobility, their representations of the border and, potentially the existence of a cross-border identity.Drawing on extensive original qualitative and quantitative data, this book will be of interest to researchers across border studies, geography, geopolitics, and cultural studies, as well as to policy-makers and other stakeholders with an interest in cross-border cooperation.