Immigrants to the Rescue, or The Cunning of Reason
Most immigrants who come to the United States come from traditional, conservative, and extremely religious nations, while nations that are considered secular and progressive, such as European countries, Japan, South Korea and Australia, send few if any immigrants to the USA.
Latin Americans make up the majority of immigrants to the United States. Democrats have been continually surprised that, considering the countless right-wing racist attacks they have endured (including candidate Donald Trump calling Mexicans who sought to come to the United States drug users and rapists), that they do not form a solid Democratic block. They don't. In fact, some 32 percent of Hispanics say their political views are "very conservative" or "conservative." This percentage is about in line with American adults in general.
In Texas, a quarter of Latinos voted for Ted Cruz over Beto O'Rourke in the 2016 USA Senate race. Without that Latino support, Cruz would have lost his senate bid in a landslide.
As for Sub-Saharan African immigrants, they tend to be conservative and extremely religious. Many find Western culture to be hopelessly decadent. Kevin Thomas, professor of African American and African diaspora studies at The University of Texas at Austin, notes that, in terms of political ideology, Black immigrants tend to lean more on the conservative side than the liberal side. This is in contrast to native-born Blacks who most often describe themselves as moderate Democrats.
One self-described moderate Republican Nigerian immigrant sounded like he was channeling your average white Trump voter when he recently told PRI, "Trump's not a politician, and he speaks his mind. Does things the way he believes things should be done. Nigerians prefer strong leaders."