NATIONAL BUREAU OF ECONOMIC RESEARCH
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How the Other Half Died: Immigration and Mortality in US Cities

Philipp Ager, James J. Feigenbaum, Casper Worm Hansen, Hui Ren Tan

NBER Working Paper No. 27480
Issued in July 2020
NBER Program(s):Development of the American Economy, Health Economics

Fears of immigrants as a threat to public health have a long and sordid history. At the turn of the 20th century, when millions of immigrants crowded into dense American cities, contemporaries blamed the high urban mortality penalty on the newest arrivals. Nativist sentiments eventually led to the implementation of restrictive quota acts in the 1920s, substantially curtailing immigration. We capture the "missing immigrants" induced by the quotas to estimate the effect of immigration on mortality. We find that cities with more missing immigrants experienced sharp declines in deaths from infectious diseases from the mid-1920s until the late 1930s. The blame for these negative mortality effects lies not with the immigrants, but on the living conditions they endured. We show that mortality declines were largest in cities where immigrants resided in the most crowded and squalid conditions and where public health resources were stretched the thinnest. Though immigrants did die from infectious diseases at higher rates than the US-born, the mortality decline we find is primarily driven by crowding not changes in population composition or contagion, as we show mortality improvements for both US- and foreign-born populations in more quota-affected cities.

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Document Object Identifier (DOI): 10.3386/w27480

 
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