Japanese diaspora archaeology originated in the late 1960s but reports and publications did not appear until the 1980s. Early studies often included Japanese artifacts or sites within larger surveys, but by the 1990s and 2000s were the focus of targeted research. Most research has been undertaken in western North American and the Pacific Islands. PreWar farms and work camps and World War II battlefields and incarceration centers emerged as primary topics of study, with the incarceration centers dominating the literature today. Research themes are diverse but emphasize material consumption, concepts of place, and patterns of cultural persistence and change.