The Age of Mass Migration (1850-1913) was among the largest migration episodes in history. During this period, the United States maintained open borders. Using a novel dataset of Norway-to-US migrants, we estimate the return to migration while accounting for migrant selection across households...

Using two million census records, we document cultural assimilation during the Age of Mass Migration, a formative period in US history. Immigrants chose less foreign names for children as they spent more time in the US, eventually closing half of the gap with natives. Many immigrants also...