No, it's not the vastly different views per se. To be clear, Nordic immigrants have always been totally welcome in America but like totally, they are the model immigrant. Maybe Norwegians for some period of time weren't quite as welcome because they were poor, I mean I suppose this fact, I haven't encountered any evidence.
Witness the lack of slurs for Nordics, I have no idea which they are. I'm sure they exist. I know more slurs for doctors than Nordics...wait I think I know one, "dumb blonde", and "rusio" is another one, in Chile..."gringo" in Chile..."borsch" I think is one for Germans though, it's really old, there's others, but not Nordic. "Honkey" comes from "Hungarian"...some Hungarians are very fair...I'd need like a slur dictionary to find a slur for Nordics.
These slurs must all be said at some point, it's irrelevant if I say G-R-I-N-G-O or "gringo", because putting it in writing and spelling it out is literally the same thing, you can read either just as well. For these particular slurs nobody can figure out what the hell I'm writing about if I don't write them in full. Similarly, History professors in Chilean universities can't tell their students about the "n-word" without actually saying it out loud, for real, at some point. They otherwise will never know what the professor is talking about.
Back to Nordic immigration. So yeah, if Swedes arrive next door and the women dress differently, and they recycle all kinds of things Americans don't recycle, like I guess if they yodeled that would piss people off...it would take some work. And white Americans surprise surprise are very tolerant of very different views if they like them. The big thing with the "poor" or "poors" (the worst slur in my whole comment) is the poverty is related to entropy. Same thing pretty much. So more entropy in their nervous system, more entropy in their bodies, more entropy in their housing, more entropy in how they communicate and their habits, more entropy in their relationships, more entropy in how they deal with neighbors ultimately. Reducing entropy in one thing means increasing it in another. On the other hand, if the poor who move in haven't always been poor, or have an excellent reason to be poor, or are rapidly moving up in society, or something else of that nature, they are not as entropic and are therefore welcome.
And that's why there was such a huge social movement to make education free and obligatory, because then you reduce the entropy in the minds of the poor, and that order (meaning strictly absence of entropy) radiates from there into everything else.