WASHINGTON (AP) - Within weeks of Inauguration Day on Jan. 20, the Biden administration had reversed many of the most maligned Trump-era immigration policies, including deporting children seeking asylum who arrived alone at the U.S.-Mexico border and forcing migrants to wait in Mexico as they made their case to stay in the United States.While the administration was working on immigration legislation to address long-term problems, it didn’t have an on-the-ground plan to manage a surge of migrants.