Well belsen comes up in the definition of concentration camp. “a place where large numbers of people, especially political prisoners or members of persecuted minorities, are deliberately imprisoned in a relatively small area with inadequate facilities, sometimes to provide forced labor or to await mass execution. The term is most strongly associated with the several hundred camps established by the Nazis in Germany and occupied Europe in 1933–45, among the most infamous being Dachau, Belsen, and Auschwitz.” Either way, theyre detention centers, not concentration camps. Based on your definition the US was running concentration camps to the Japanese in ww2, do you agree?