Also, they're white, and that plays a role--even today there's a surprising number of undocumented Irish immigrants to the United States but nobody's out there asking for reactionary measures to that.
It's not always racism...but it is mostly ladder-pulling, and economically unrealistic ladder-pulling at that. (Ask a farmer.)
Or is it that they feel those immigrants are unfairly taking something from them? And if so, is that really true or just FUD?
How much of the sentiment boils down to "those illegals are taking our jobs!"? How many people who hold that sentiment would actually want & take the job being filled by one of those immigrants? If their argument is instead that the illegal immigrant labor depresses wages for that set of jobs, how many of those people are willing to pay the extra cost for the products once the company paid fair market wages?
https://www.nytimes.com/article/nyc-migrant-crisis-explained...
What resource and logistical problem? The US isn't a command economy, and it's not a social welfare state that extends its largess to anyone within its borders that has a pulse.
Immigrants, legal or otherwise, have to earn their keep, same as everyone else. And there are no natural shortages of... Anything in the US.
Despite the castigation of Latin American immigrants as un American, Hispanics are quite patriotic and successful, even the ones who's families came here without documents