Analysts say the influx helped fuel the economy.
As the U.S. economy of the 1990s grew from sour to sizzling hot, economists kept scratching their heads over several big questions. It's either been a large change in our immigration or a phenomenal change. The new estimates also show that the government crackdown on illegal immigration has been much less successful than believed. They've had huge earning drops. And yet this is the part of the market we're flooding with foreign-born workers.