You've taken leave of your senses - most of illegals can't even read spanish, much less run a business. Contrary to your claim of increasing the tax base, they would be a huge new drain on the welfare system - just what we need now, right? The low assimilation rate of such people would severly balkanize the country like quebec and canada, only much worse. The leftwing supports the illegal alien invasion because they envision millions of newly-minted democrat voters, and with their high birth rate and chain immigration, tens of millions more, thus resulting in permanent political power for the leftwing, at the cost of destroying this country, which oif course they don't care about. And mexicans don't cross the border "anyway", they do it because RINOs and the leftwing won't enforce immigration laws, the former because they want to provide cheap labor for their corporate friends, the latter as explained above.