Hispanic Voters in This Pennsylvania City Are Shifting Toward the GOP. Both Parties Want to Know Why.

Joseph Nuñez at first didn’t like Donald Trump. “I couldn’t stand the guy. I didn’t like the way he spoke about Hispanics or people in general,” he said. But by 2020, Mr. Nuñez had become a fan of Mr. Trump’s style and priorities, and he voted in favor of giving the president a second term.

So did many other Latino voters in this working-class city who had once backed Democrats or, like Mr. Nuñez, had skipped elections altogether. Now, as political strategists continue to sift through the 2020 election results, the emergence...