On May 21, 2021, Eduardo Moncada, assistant professor of political science, published new research in the Journal of Health Politics, Policy and Law, which he co-authored with five professors from Brown University and American University. “Who Stays at Home? The Politics of Social Distancing in Brazil, Mexico, and the United States during the COVID-19 Pandemic” is part of a special journal issue that focuses on subnational COVID-19 politics and policy. In their research, the authors explore whether social distancing policies that were issued in response to the COVID-19 pandemic actually changed behavior at the population level and, if so, what political, socioeconomic, and epidemiological factors influenced their effectiveness. By leveraging subnational variation in the stringency and timing of state-issued social distancing policies from March to December 2020 across 109 states in Brazil, Mexico, and the United States, the researchers were able to assess the effects of these policies. Findings showed that in Brazil and the U.S., mandatory stay-at-home orders and workplace closures jointly reduced mobility, especially early in the pandemic, whereas in Mexico, where federal government intervention created greater policy uniformity across states, workplace closures produced the most consistent reduction in mobility.