WASHINGTON—The Biden administration says many American citizens holding recently expired U.S. passports will be allowed to return home from abroad on that document until the end of year. Citing delays in passport renewals caused by the coronavirus pandemic, the State Department said certain passports that expired on or after Jan. 1, 2021, will be honored for reentry into the United States until Dec. 31. That’s because the pandemic forced the department and most embassies and consulates to close down or significantly reduce passport services. “U.S. Customs and Border Protection officers will accept for admission certain expired U.S. passports, thereby assisting U.S. citizens who have been affected by appointment backlogs at embassies and consulates overseas caused by the COVID-19 pandemic,” the department said in a notice issued late Monday. The closures resulted in waiting times of more than two months in some cases for processing passport renewals, and a significant backlog …