Keep in mind also that those who came here were often the more ambitious ones, and you see this today with the entrepreneur class among Latin/Filipino/Vietnamese immigrants. Nevertheless, there was a large population of folks who were dependent on the city or the union for their low status jobs which kept them living in the same ethnic ghettos for three generations, as they failed to shake the "village"/tribal mentality towards material success and upward mobility.
It was even worse back in Europe itself, where the larger culture was dominated by the "material success and surpassing your family is Pride" ethos. Again, this changed in several countries at different times (France in the 1840s, Ireland in the 1970s, Brazil in the 1990s, etc.) but you can't deny it was a major factor keeping Catholic cultures in relative poverty.
east of shaker hts is the city of beachwood, very affluent etc. take a look at the colleges where BH grads end up...mostly 2nd rate schools.
so even in richer bwood, you find disappointment.
cleaveland is a chronically underachieving, god forsaken - blighted city.