What makes you think Germany was more diverse than England/UK et al? Some times "nations"/"ethnicities" didn't have their own single country because they were

What makes you think Germany was more diverse than England/UK et al? Some times "nations"/"ethnicities" didn't have their own single country because they were "conqured" by another (e.g. the Irish in the then-UK), and sometimes it was because the people in that ethnicity/nation were split amoung several states (e.g. Germany & Italy)