A Border without Guards: First Nations and the Enforcement of National Space
Abstract from the Author, Page 89:
"During the mid-to-late nineteenth century, the American Civil War, Canadian Confederation, transnational violence, and rising concerns over undesirable immigration increased anxieties in Canada and the United States over the permeability of their shared border. Both countries turned to a combination of direct and indirect control to assert their authority and police movement across the line.