Who said anything about republicans? I’m an immigrant from a country that exists because it split off from another country due to cultural differences (even though nearly everyone in the story was a “brown” Muslim). It would be hypocritical as hell for me to complain that Trump voters in Wisconsin feel the same way.
Nearly all the people immigrating to the US come from countries that believe the same thing as republicans: one cultural group has no moral obligation to invite another cultural group over the border to share democratic governance of their country with them. Indians believe that, Chinese people believe that. Japanese people, Koreans, everyone in the Middle East. Mexicans would flip out if mass immigration from Guatemala was flipping elections in their country.
Ironically, the liberal American view of this reduces to the assertion that a handful of mostly European descended people in the developed world are correct about the nature of nationhood while everyone else is wrong.