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The global migration wave of the 21st century has little precedent. In much of North America, Europe and Oceania, the share of population that is foreign-born is at or near its highest level on record.
In the U.S., that share is approaching the previous high of 15%, reached in 1890. In some other countries, immigration increases have been even steeper in the past two decades.
This scale of immigration tends to be unpopular with residents of the arrival countries. Illegal immigration is especially unpopular because it feeds a sense that a country's laws don't matter. But large amounts of legal immigration also bother many. Lower-income and blue-collar workers often worry that their wages will decline because employers suddenly have a larger, cheaper labor pool from which to hire.
As Tom Fairless, a Wall Street Journal reporter, wrote a few days ago:
"Record immigration to affluent countries is sparking bigger backlashes across the world, boosting populist parties and putting pressure on governments to tighten policies to stem the migration wave. …
"The backlashes repeat a long cycle in immigration policy, experts say. Businesses constantly lobby for more liberal immigration laws because that reduces their labor costs and boosts profits. They draw support from pro-business politicians on the right and pro-integration leaders on the left, leading to immigration policies that are more liberal than the average voter wants."