Immigration policy reform is one of America's most polarizing topics.

Until we fully understand the impact of immigration on the economy, the debate will keep getting uglier, says MarketWatch columnist Howard Gold.

Gold sees the massacre of innocents in San Bernadino early this month as an inflection in the conversation, controversy, and policy on immigration. An important area of focus, he writes, is the fact that both very well-educated and very poorly-educated Americans are the ones who take a negative hit from the impact of immigration:

High school dropouts and people who have additional education beyond college — are the biggest losers, while immigrants themselves and the employers who hire them reap the rewards.

Between 1990 and 2010 alone, the number of immigrants in the U.S. doubled to 40 million, while illegal immigrants more than tripled to 11.7 million.
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