During World War II, Kashiwagi and his family were sent to “Tule Lake” internment camp after Executive Order 9066 of the year 1941. Kashiwagi and others at “Tule Lake” lost their American citizenship under the “Renunciation Act” of 1944. In the post-war years Kashiwagi and 5,000 other “Tule Lake” internees had their citizenship restored. In 1954, Kashiwagi wrote the play “Laughter and False Teeth”; and, this was the first play set inside a WW-II Japanese-American internment camp. From 1966 to 1987, Kashiwagi worked for the San Francisco Public Library at the Western Addition Branch (in Japantown San Francisco).