As the U.S. Congress talks about immigration reform, we remember that the United States is a country of immigrants. The group Hiroshima helps to show how diversity is the backbone of the country. When Japanese Americans, Dan and June Kuramoto, formed the group in East Los Angeles, they wanted to bring in other cultures to the mix, including Asian, Latin and African American, and others. By doing that, the group has helped to establish a style all their own. Their newest CD Little Tokyo …