It depends which people. I read Jean Raspail's "The Camp of the Saints" in 1973, when it came out. I was also concerned way back when they changed the immigration laws. And I didn't like Reagan's amnesty.
But if you are talking about ordinary people, and the great majority of voters, then I think they have only recently started to become aware of the problem.
Obviously it also depends where you live. Immigration used to be a problem for California and the Southwest, but now it's all over the country.
New York mainly had a Puerto Rican problem, which is a whole other kettle of fish. On the whole, it's less bad now than it used to be.
Again, f-ggot Manhattanites love the Mexicans who bring them food, but I would LOVE to see them walk around the barrios of Corona and Port Richmond on a Saturday night!