Japanese Americans know about internment. My wife Erin's parents, grandparents and great-grandparents on both sides were rounded up from Sacramento County, Calif. and eventually imprisoned at Rohwer, one of two concentration camps in Arkansas built during World War II to house Japanese Americans out of fear and racial hysteria. There were 10 in all, including Camp Amache in desolate southeastern Colorado. (Note: There's been a gradual move towards the use of the term "concentration camps" because that's the term the U.S. government used for them when they weren't using euphemisms like "assembly center" or "relocation center.")
For many older Japanese Americans, the first thing they ask of each other when they meet other JAs is, "what camp was your family in?" and they're not talking about summer camp.