What’s the relevance of their service in WWII? I’m not questioning their character, I’m pointing out their immigration fundamentally changed the country, which is undeniably true. In the aggregate, Irish American culture was (and maybe still is) different from the founding cultures of the US. The Irish immigrants did not have an established tradition of small-scale self governance the way the founding Americans did. So when they were given the vote, they voted to change the country.[1]

As I said above, we can argue about whether those changes were good or bad. My point is that the changes were fundamental. The country was supposed to look more like New Hampshire than New York.

[1] I go to a church that happens to have a high representation of northeastern Congregationalists. We had an ice breaker activity where we went around and talked about what we liked to cook. They were almost apologetic about it. They started their stories with “well I grew up being taught cooking was just for sustenance, …” They cut donuts in half at events so nobody feels tempted to take more than they should eat. It is incomprehensible to me as someone from South Asia. But it’s the basis for a worldview that does affect how those people would run the country: https://www.nytimes.com/2018/12/05/opinion/george-bush-wasps...