> nobody takes issue with a Swede waving their flag on midsummers eve or some 6th generation irish folks getting drunk on st patricks day eh?

A member of my wife's family is Swedish American. Her Swedish identity is superficial, a historical curiosity. Swedish Americans aren't glued together in any meaningful way by a common identity, they don't seek each other out to live near each other. Nor can you influence them by appealing to their Swedish heritage. By contrast, I have on multiple occasions gotten comped meals from hotel workers based on being Bangladeshi. Bangladeshis in the US and Canada feel real affinity for each other--they live in Bangladeshi neighborhoods, marry within their communities, etc. And you can influence them by appealing to their shared identity.

Irish identity is largely superficial today, but for a century it wasn't. They lived in Irish enclaves, they did favors for each other based on shared identity, and they organized politically based on ethnic background, not ideology or issues. And that had real social and political consequences for the country for a long time.

Indeed, Americans underestimate how different Irish and Swedish Americans really are from Anglo Americans even today. Americans descended from different European countries remain quite different in fundamental attitudes (e.g. social trust, views towards saving, etc). And they still vote quite differently as a result. It's also obvious just going around America. As a foreigner, it's blatantly obvious which parts of the country was settled by Italians, Scandinavians, Germans, different kinds of British, etc.