The American-led global "war on terror," launched 20 years ago after the Sept. 11, 2001, attacks against the United States, was already faltering before President Joe Biden took office.

Now it may not recover from the blow delivered by Biden’s historic blunder in facilitating the Taliban’s return to power in Afghanistan. The flag of the world’s deadliest terrorists — responsible for killing over 2,000 U.S. soldiers since 2001 — will fly above Kabul on the 20th anniversary of the 9/11 attacks.

By empowering the Taliban, Biden has empowered all violent Islamist groups, thus making the rebirth of global terror highly likely. And by betraying one ally — the Afghan government — he has made other American allies feel that the U.S. could abandon them, too, when the chips are down.