“The immigration debate gets one thing right: The foreign-born population is growing. In 2012, according to data from the Census Bureau, there were more than 40 million people living in the U.S. who weren’t born here, up 31 percent since 2000. … The drivers of that growth, however, have changed significantly in recent years.”
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http://fivethirtyeight.com/features/immigration-is-changing-much-more-than-the-immigration-debate/