With 221,644 deportations last year, a thin trickle of legal immigration, the capping of visa programs like the H-1B to a paltry 65,000 a year, and limited student visas, the government is very hostile to immigration.
Black markets, like illegal immigration, only exist when the government outlaws things that people want. Americans want to employ foreign labor, ergo there will be immigration. Whether it is legal or not is up to the government.