It is through these mundane interactions that Sone illustrates the process of assimilation, in which members of a minority group adopt the behaviors and attitudes of the majority population among which they live. In Nisei Daughter, the question of assimilation becomes especially complex, as the Issei were more resistant to letting go of their once-strong heritage. While most Nisei have made a great effort to assimilate, a significant segment of the American population appears to resist, and even hinder, these efforts. This brought yet another conflict between the two generations of Japanese Americans during World War II