Sean Last has correctly pointed out that Ellis Islander assimilation is mostly a myth, at least politically. When looking at white ethnic groups, generally only the traditionally Protestant ones are majority (R).
But was a simple partisanship analysis misses is that this is basically a consequence of the Mean Voter Theorem. Whites are still a supermajority of US voters, so the dividing line between parties is among generally leftish white ethnic groups.
If you look at political views (specifically: govt redistribution, free speech, gun ownership, govt regulation, and postmaterialist values), rather than partisanship, there is a clear clustering of white ethnic groups.
Note that there are basically three major clusters: white people, who are generally libertarian-ish across the board, low IQ black/brown people, who are generally left across the board, and Asians, who are anti-redistribution, but pro-gun control and anti-free speech.
Credit to @AnechoicMedia_ for the graph and analysis.
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