The introduction traces the historical interaction of Japanese immigrants (Issei) and their children (Nisei, Kibei, and Sansei) with the largely Caucasian American majority. Beginning in 1906 with the San Francisco School Board case, the interaction of the two groups unfolded in a series of conflicts. The California Land Laws of 1913 and 1920, diplomatic disagreements during World War I, and general restriction of American immigration of 1924 which banned all Japanese immigration, each in turn roiled the waters. These relations were complicated further by Japanese claims that their immigrants were still under the jurisdiction of the Empire and that the territory occupied by Japanese immigrants was almost an extra-territorial possession of the Empire, a kind of Overseas Japan. That sentiment angered Americans who thought that it compromised American nationality. However during the 1930s such Imperial claims were muted and Nikkei progress was steady. Beginning in 1928 with the founding of the Japanese American Citizens League (JACL) the Nikkei (all American Japanese) undertook a precocious campaign to win a place in American life. By World War II the Nikkei had made considerable progress toward acceptance, especially in California, home of the largest group of Mainland Japanese. At that point there was no large-scale movement to remove the Nikkei from the West Coast. None was likely either. The Japanese older generation with closest ties to Imperial Japan was dying out and being rapidly replaced by the Nisei. That removed the principal objection to the Americans of Japanese Ancestry and thus the putative provocation against the group as a whole.