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Your study is based in the States, which has a long history of segregating cultures and even language according to ethnic lines. On the other hand, I mean is that both Switzerland and Germany have a diversity of peoples, cultures and languages (e.g. Switzerland itself has 4 official languages and German has a myriad of dialects) and many citizens of these countries consider themselves pretty diverse in that regard though they are mostly white, but is that what people mean by "diversity" when they talk about "population heterogeneity"? Or is it just "diversity is when people have different skin tones and the more skin tones there are the more diverse it is"?