So-called de-industrialization is a factor of imperialism, as is so-called illegal immigration.
Manufacturing was moved to superexpoit labor in the Global South. It reduced the size of the industrial proletariat and broke the militant power of its unions, turning them aristocratic. NAFTA, specifically, turned Mexico into a labor colony with the maquiladoras replacing internal production.
Undocumented workers, on the other hand, are a result of that imperialist superexploitation. On top of that they are themselves internally colonized subjects that are superexpoited for primary production.
Where does a labor aristocracy come from without that superexploitation of labor?