[Clemenza]

Were hit by their German, Italian, Polish, etc. parents for speaking German, Italian, Polish, etc. because the Europeans who came to America before WW2 came her because they wanted to be Americans and wanted their children to be Americans

Not always true. German schools and German speaking enclaves existed in this country from the colonial period until WWI and the anti-German hysteria.

Most Italian and Polish immigrants settled in ethnic ghettos where the first generation only associated with their own countrymen and spoke their languages. My great-grandmother never learned more than a few words of English. None of my grandparents learned English until they went to public school.

This "we're all Americans" stuff is a product of WWII.

[Question_Assumptions]

My family is from Depression-era Jersey City and while there were certainly ethnic clubs (including the infamous German-American Bund), my familiy did in fact know people whose parents so wanted them to be American that they'd get hit at home if they spoke their parents' language at home instead of English. And my grandfather did sit my two Scotland-born uncles down, when my grandmother finally joined him in the US with my uncles, and tell them that they were American know and if they wanted to be Scottish, they could go back to Scotland. You are correct that there were people who lived in ethnic ghettos but there were plenty more who realized that their ethnicity was contributing to their problems who wanted to be Americans.