We estimate the self-selection of Mexican migrants into and out of the United manifests, which we use to proxy migrant quality and to measure self-selection into migration in 1920. Migrants were positively selected on height compared to the Mexican population. We link these migrants to the 1930 U.S. and Mexican the selection into return migration. Return migrants were not differentially selfselected on height relative to permanent migrants.

We present new estimates of the outcomes of first-generation Mexicans and their descendants between 1880 and 1940. We find zero convergence of the economic gap between Mexicans and non-Mexican whites across three generations. The great-grandchildren of immigrants also had fewer years of education. Slow convergence is not simply due to an inheritance of poverty; rather, Mexican Americans had worse outcomes conditional on the father’s economic status. However, the gap between third-generation Mexican Americans and non-Mexican whites is about half the size today as it was in 1940, suggesting that barriers to Mexican American progress have significantly decreased over time.

The first mass migration of Mexicans to the United States occurred in the early twentieth century: from smaller pre-Revolutionary flows in the 1900s, to hundreds of thousands during the violent 1910s, to the boom of the 1920s, and then the bust and deportations/repatriations of the 1930s. We show that despite these large shifts, the rate of economic assimilation was remarkably similar across arrival cohorts. We find that the average Mexican immigrant held a lower-paying job than US-born whites near arrival and further fell behind in the following decade. However, Mexican assimilation was not uniquely slow since we also find that the average Italian immigrant fell behind at a similar rate. Yet, conditional on geography, human capital, and initial earning score, Mexicans had a slower growth rate than both US-born whites and Italians. We argue that Mexican-specific structural barriers help to explain why Mexican progress was slower than other groups and why different Mexican arrival cohorts had limited variation in outcomes despite the large shocks to migration.

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