"The total number of people officially considered unemployed rose by 27,000 during December (2004) to 8,047,000. Those considered long-term unemployed—out of work and seeking a job for at least six months—dipped slightly in December to 1.6 million (20.2% of total unemployed)." -- Bureau of Labor Statistics
We have roughly six and a half million people moving from one job to the next during the month of December, and 1.6 million who have been looking for work for more six months or longer; we have somewhere between eight and ten million illegal aliens in the U.S. doing some kind of low-end jobs.
We abort one million babies per year, and the baby boom generation is standing on the threshold of retirement. Right now, we don't have enough workers to cover the Social Security bill from the boomers, and the retiree to worker ratio is about to drop to a critical level.
What happens to the U.S. economy if we remove from it more workers than it requires to function?
Something like 1929.
You understand probably also understand that we have a much easier task integrating Hispanics immigrants into our culture while they are helping to finance our retiring generation than Europe does integrating all those Muslims.