Recent Center for Immigration Studies field work reveals a growing crisis in the Mexican southern state of Chiapas. Why are thousands of migrants bottled up in this area near the Guatemala-Mexico border, and why are caravans forming but only moving within Chiapas? On-the-ground reporting by Todd Bensman, the Center’s national security fellow, highlights the impact of the Biden-Harris administration’s December 2023 deal with Mexico and the potential consequences leading up to and following the U.S. election.