T his week could mark the most consequential development on the U.S.-Mexico border since January 2021, when President Joe Biden essentially opened the nation’s doors to millions of illegal border crossers. Depending on how court fights turn out, Title 42, the Trumpera measure that allows the U.S. government to quickly return illegal crossers to Mexico on the grounds of preventing the spread of COVID, will likely soon expire. After that, officials expect a flood of illegal crossers, all coming into the United States confident that they, like hundreds of thousands before them just this year, will be allowed to stay.