Land of Demons: The Proto-Colonization of Ezochi, an Alternate Model of Japanese Expansion

Long before Japan was united under the Tokugawa Shogunate, the northern island of Ezo (modern Hokkaido) was invaded, ruled, and pillaged by the Japanese for financial and political gain, marginalizing the native people there. They never officially colonized the island until the late 1800s but for centuries, practiced "proto-colonization."