The fact is that we had an open border with Mexico for several centuries, and "illegal immigration" was never a serious problem. Before Reagan's presidency, an estimated million or so people a year came into the US from Mexico - and the same number, more or less, left the US for Mexico at the end of the agricultural harvest season. Very few stayed, because there weren't jobs for them. Non-citizens didn't have access to the non-agricultural US job market, in large part because of the power of US labor unions (before Reagan 25% of the workforce was unionized; today the private workforce is about 7% unionized), and because companies were unwilling to risk having non-tax-deductible labor expenses on their books by hiring undocumented workers without valid Social Security numbers. But Reagan put an end to that. His 1986 amnesty program, combined with his aggressive war on organized labor (begun in 1981), in effect told both employers and non-citizens that there would be few penalties and many rewards to increasing the US labor pool (and thus driving down wages) with undocumented immigrants. A million people a year continued to come across our southern border, but they stopped returning to Latin America every fall because instead of seasonal work they were able to find permanent jobs. The magnet drawing them? Illegal Employers. Yet in the American media, Illegal Employers are almost never mentioned. Lou Dobbs, the most visible media champion of this issue, always starts his discussion of the issue with a basic syllogism - 1. Our border is porous. 2. People are coming across our porous border and diluting our labor markets, driving down US wages. 3. Therefore we must make the border less porous. Lou's syllogism, however, ignores the real problem, the magnet drawing people to risk life and limb to illegally enter this country - Illegal Employers. Our borders have always been porous (and even with a "fence" will still allow through "tourists" by the millions), but we've never had a problem like this before. Yet fifty years ago we didn't have an "illegal immigration" problem, because back then we didn't have a conservative "Illegal Employer" problem.