Trade and investment policies face a changing geopolitical environment. They also face challenges from the interactions and limits of Canada's multiple trade agreements with other countries. These challenges take on varied forms in different sectors that involve the bordering of energy trade, food safety, and related environmental and public health issues. Similarly, bordering dynamics differ significantly for cross border flows of tourism, skilled labour, and irregular migration. This book uncovers and analyzes factors that govern economic activity and human interaction across Canada's "fluid" border. The contributors to this collection engage major domestic political, technical, and administrative factors that shape the conditions for and constraints on effective international policy and regulatory cooperation. Published in English.