“US policy isn’t solely to blame for the adverse conditions in Mexico that may have contributed to the tragedy at the migrant detention center. As a result of Trump-era policies that have largely continued under the Biden administration, there are now more migrants than ever waiting in Mexican border cities to enter the US as a result of policies pursued by the Trump and Biden administrations. As of late December, there were a record estimated 20,000 migrants waiting in Juárez alone.
But Michelle Mittelstadt, a spokesperson for the Migration Policy Institute, a nonpartisan think tank, said the Mexican government can invest more in expanding its capacity to accommodate migrant populations that include families and unaccompanied children.”
https://www.vox.com/politics/2023/3/29/23661869/fire-migrant-detention-mexico