I'll give the example I usually give in this debate: In Netherlands, prior to World War 2, they made a "comprehensive population registration system for admini

I'll give the example I usually give in this debate: In Netherlands, prior to World War 2, they made a "comprehensive population registration system for administrative and statistical purposes", which included the ethnicity. As a result, the Netherlands had one of the highest death rates among Jews. (I can't find a good source for this though, unfortunately)