U.S. Immigration and Ancestry Instruments
This website provides instruments for country-to-county immigration and country-level ancestry data in the United States. It also provides the transitions from historical counties to 1990 counties that are used in generating the instruments. Our papers, referenced below, provide details on how each instrument is constructed.
The research leading to these results has received funding from the European Research Council under the European Union’s Horizon 2020 research and innovation programme (Grant Agreements no. 337272 and 884847) .