The research conducted at the Rockefeller Archive Center (RAC) will form an important part of my dissertation on the transnational politics of female reproduction in the context of U.S.- Japan relations before and after World War II. My study starts from the period right after World War I, notably the events surrounding Margaret Sanger's first tour around the world, which began with her trip to Japan in the spring of 1922. Sanger's visit not only stimulated the modern birth control movement in Japan, but it also brought about the rise in transnational birth control and population control movements. Sanger, however, was not the first person to notice the special need for population control in Japan. Her transnational activism represented a broader interest in the United States concerning the rise of Asian populations and the threat that it posed to world peace - more specifically, to the status of "white supremacy" in the world.