Yes we can. If we have the will...
We don't have the political will. It would help if we could deny public benefits to illegal immigrants, and enforce the law against employing illegals. But we don't even do that. The City of Concord even built a day laborer center at tax payer expense so illegals have a place to gather when looking for work. Turns out that they don't like the location (it has been set back a block or two from Monument Blvd, and they want to be right on the main drag) so it seems that they're back hanging out in front of the 7/11 store.