If you're looking for interesting non-fiction reads you could do substantially worse than Vincent Cannato's American Passage: The History of Ellis Island. It gives a good historical overview of the island itself but, more interestingly, a tour through 19th and early 20th Century nativist / anti-immigration movements in American politics.
The striking thing is to compare historical examples to the modern equivalent on full-throated display through the Trump campaign. The rhetoric of anti-immigration rabble-rousing has not changed in 150 years. Not one bit. A simple ctrl-F find and replace for the relevant nouns – Irish, Italian, Oriental, Mexican, A-rab, etc. – would fit the material seamlessly into any period in American history. And this is true across classes as well, from the highbrow arguments about "stock" and "moral tone" from your Henry Cabot Lodge / National Review types to quasi-economic "They Took Our Jorbs" rhetoric to the lowest kind of racism and xenophobia. The modern anti-immigration movement is the latest iteration of an ideology that hasn't had a new idea in two centuries. If the "terrorist" angle feels new, refresh your memory on what "anarchist" meant in the context of Gilded Age politics.
Most ideas evolve over time, if only incrementally. You almost have to admire the immutability of xenophobic rhetoric. Almost. It's like the Rock of Gibraltar of being an asshole.