President Trump said large, organized caravans of Central Americans are on the march to the United States. This is exaggerated. A new caravan of thousands of migrants from Central America was headed north as of the end of January, and some of the travelers said they intended to try to cross into the United States. But many in the caravan have said they plan to remain in Mexico, thanks in part to policies put in place by the new Mexican government. President Andrés Manuel López Obrador has made it easier for Central Americans to get visas and work in Mexico. President Trump’s warnings of an imminent invasion from new caravans is overstated.