 When the Canadian government began the internment of Japanese Canadians following the Attack on Pearl Harbor, one camp was formed in the present day Sunshine Valley, and the workers built the current Hope-Princeton highway, which was completed in 1949.The current route of the Hope-Princeton highway follows the route of the Allison Pass Trail, which was constructed in 1859-1860.The approximate route of the current Hope-Princeton highway was considered by the Great Northern Railroad, which led to much land being purchased along the predicted route prior to the formation of the park.