We do indeed. Unfortunately, many Americans only see the costs, not the benefits, of allowing labor to move as freely as goods do. When the Irish began to arrive on our shores and began working on the cheap, there were complaints that general wages would drop and that it would ruin the economy. Similar complaints were directed towards the Italians, blacks who migrated north after the Civil War, etc. But despite the accelerated immigration of the early 20th century, the U.S. saw major economic progress until the Great Depression came on due to factors that few economists would probably attribute to immigration. Today, many Mexican immigrants are, unfortunately, receiving the same treatment as was doled out to many of our own ancestors, and for the same reasons. This is not to say that there aren't some economic problems that arise from immigration. On the whole, though, I suspect that history may be inviting us to consider its many lessons regarding the benefits of individual liberty.