The Japanese colonial empire was composed of territories adjacent to the Japanese archipelago, ranging from Southern Sakhalin in the north to Taiwan in the south. Unlike most European powers, Japan did not acquire colonial territories that were far away from the metropolis; rather, it did so within the region in which it was located—East Asia. The geographical proximity between the metropolis and its colonial territories influenced not only the structure of the colonial administration, racial hierarchies in the empire, and colonial and metropolitan identities but also the rhetorical strategies that were used to legitimize colonial rule. Although the government generally envisioned a European-style empire, the creation of which would earn Japan the respect of the Great Powers and eventually lead to the recognition of Japanese equality, a significant number of politicians, writers, and activists argued that it was Japan’s mission to unite the Asian people and protect or liberate them from Western colonial rule. These discourses have been summarized under the term “Pan-Asianism,” a movement and an ideology that emerged in the late 19th century and became mainstream by the time World War I began. However, although some advocates of Pan-Asianism were motivated by sincere feelings of solidarity, the expansion of Japanese colonial rule and the escalation of war in China and throughout Asia in the 1930s brought to the fore an increasing number of contradictions and ambiguities. By the time World War II started, Pan-Asianism had become a cloak of Japanese expansionism and an instrument to legitimize the empire, a process that culminated in the Greater East Asia Conference of 1943. The contradictions between Japan’s brutal wars in Asia and the ideology of Asian solidarity continue to haunt that country’s relations with its neighbors, by way of ambiguous historical memories of the empire and war in contemporary Japanese politics and society.
The temporal span of the Japanese Empire is most commonly given as 1895–1945, from the acquisition of Taiwan following Japan’s victory in the First Sino-Japanese War to Japan’s defeat in the Second World War. Within this interpretation, the Japanese Empire was largely a reaction to the advances of the Western colonial powers during the 19th century. This “orthodox” narrative of the empire rests on a key assumption: the current borders of the Japanese state demarcate the inherent territory of Japan. But when viewed from Japan’s northernmost island of Hokkaido, a second story of the Japanese Empire emerges. Before 1869 Hokkaido was known to Wajin (ethnic Japanese) as Ezo. While the Japanese considered Ezo to be within their sphere of influence and there was a Japanese zone (Wajinchi) in the southern tip of Ezo from the 16th century, Ezo was a foreign land inhabited by the Ainu people. Hokkaido was only fully incorporated into the Japanese state in 1869 following the Meiji Restoration (1868), after which Japanese settlers colonized the island beyond Wajinchi. The indigenous Ainu people were dispossessed of their land and forced to assimilate. Rather than Taiwan, therefore, the story of the Japanese Empire begins with the colonization of the peripheries of the modern state: Hokkaido, and also Okinawa. Seeing imperial history from the vantage point of Hokkaido sheds light on some of the assumptions and oversights of much writing on Japan’s 19th- and 20th-century history. It reveals how the legacies of empire affect Japanese people today in those spaces where the colonizers and colonized continue to coexist. And it gives insights into how official and popular narratives of empire and war have been formulated at local and national levels in the postwar era.