What is the main conflict in Kira-Kira by Cynthia Kadohata?

This is Kadohata's first book for young adults, following several adult novels. It highlights the work and life experiences of Japanese Americans in the pre-Civil Rights era, as well as their struggles to achieve the American dream. The novel explores the relationship between individual and community identity. In Kira-Kira, community helps to define the individual. The main character, Katie, develops her sense of self through her experiences and relationships with others—friends and family, neighbors, teachers, and peers.