For almost two centuries North America has been a major destination for international migrants, but from the late nineteenth century onward, governments began to regulate borders, set immigration quotas, and define categories of citizenship. To develop a more dimensional approach to migration studies, the contributors to this volume focus on people born in the United States and Canada who migrated to the other country, as well as Japanese, Chinese, German, and Mexican migrants who came to the United States and Canada. These case studies explore how people and ideas transcend geopolitical boundaries. By including local, national, and transnational perspectives, the editors emphasize the value of tracking connections over large spaces and political boundaries. Entangling Migration History ultimately contends that crucial issues in the United States and Canada, such as labor and economic growth and ideas about the racial or religious makeup of the nation, are shaped by the two countries’ connections to each other and the surrounding world.