Based on county-level data and linked individual samples, I examine the labor market effect of the negative immigration shock caused by theUS immigration quota system between 1920 and 1930 and identifies the causal impact of immigration restrictions on the Great Black Migration. I find that...

Based on county-level aggregate data and linked individual census samples, I examine the labor market effect of the negative immigration shock caused by the US immigration quota system between 1920 and 1930 and identifies the causal impact of immigration restrictions on the Great Black...

This paper examines how a million Manchus, as a dominant minority, partly relied on a cross-ethnic personnel strategy to rule over 100 million Han Chinese for 267 years. Under this strategy, Han elites were appointed to handle daily administrative issues, on top of whom Manchu superiors were...

Peroxymonosulfate (PMS) activation is regarded as a powerful method for the degradation of organic pollutants. Carbon materials have attracted much attention for PMS activation toward efficient nonradical oxidation process. The catalytic activity of most nanocarbon materials is usually...