Paper by Joe Long, Carlo Medici, Nancy Qian & Marco Tabellini.
This paper investigates the economic consequences of the 1882 Chinese Exclusion Act, which banned immigration from China to the United States. The Act reduced the number of Chinese workers of all skill levels residing in the US It also reduced the labor supply and the quality of jobs held by white and US-born workers, the intended beneficiaries of the Act, and reduced manufacturing output. The results suggest that the Chinese Exclusion Act slowed economic growth in western states until at least 1940.
I’m confident that Mr. Trump will provide some more opportunities to apply the diffs-in-diffs methodology.