A New Look at Immigrants’ Outsize Contribution to Innovation in the U.S.

The United States has long touted itself as a nation built by immigrants. Yet there has never been a precise measure of immigrants’ contribution to the country’s economic and technological progress. Around the time that President Donald Trump was moving to curb employment visas for skilled foreigners, economist Rebecca Diamond and a team of researchers set out to examine this unresolved question.

To find the answer, the researchers looked at the output of nearly 880,000 Americans who patented inventions between 1990 and 2016. They found that immigrants made an outsize contribution to…