Thanks. From my point of view there are differences and parallels between the two concepts: One parallel is that both concepts are intending a territory with a homogeneous population. The difference is: the concept of racial hygiene is intending a homogeneous population regarding the criterium "race" (whatever "race" might be), the concept of ethnically homogeneous states is intending a homogeneous population regarding the criterium "ethnicity". A second difference is that the concept of racial hygiene has led to more extreme forms and methods in political practice in history (example: the holocaust - not only expulsion but also extinction of millions of people in an industrially organised process). (User, Nov. 17th, 2006)