Many Americans take the stance that "I'm not anti-immigration, I'm anti-illegal-immigration." Nevertheless, the US has very restrictive citizenship & green card programs, and the quotas are a fraction of the demand for them. If we were pro-immigration, we would increase these quotes.
As a globalist: the people living south of our border are just as deserving of a livelihood as we are. This is also the reason that I don't go out of my way to buy local food-- the Chileans need it more than my fellow American farmers. (The American-born farmers had all the opportunities in the world to learn other skills, but they did not excel in high school and have consistently been using protectionism and the "buy local" meme to boost their business.)