We introduce the gravity model of international migration as the general framework for our econometric analysis, and we discuss our data sources and the construction of related variables. Having presented the empirical models and data, we examine data that span the period from 1820 through 2015 to identify the determinants of annual immigrant inflows to the U.S. and of annual inflow share values. Our models are estimated both with and without time (i.e., year) and source country fixed effects terms, and alternative functional forms and modified empirical specifications are estimated to test the robustness of our primary results.
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