Deterioration of neighborhoods as illegals cram three or four families into a unit designed for one.
Re: suppressed wages, two points. The American citizens who are displaced by the lower-paid illegals are receiving government assistance. That is another cost of illegal aliens.
When employers pay less than a living wage to illegals, they are, in essence, forcing the rest of us to subsidize their companies with the public services that illegals use because they can't afford private services.
Imagine trying to sell a decent house next door or nearby where such illegals are living. Particularly during warm weather. This happened to friends of ours in Long Island, N.Y. A real estate agent told them their lovely home would depreciate at about $10,000/week.