The United States on Sunday marked the 21st anniversary of the Sept. 11 attacks, with President Biden expressing his resolve to continue to defend the country against terrorism following the U.S. withdrawal from Afghanistan last year."And 20 years after Afghanistan is over but our commitment to preventing another attack on the United States is without end," Biden said at a memorial ceremony held at the Pentagon amid the rain. Events to honor the victims were also held in New York and elsewhere.The mastermind behind the terror attacks, al-Qaida leader Osama bin Laden, was killed by the U.S. …READ FULL ARTICLE