Why did the USA stay 20 years in Afghanistan?
When George W. Bush invaded Afghanistan, his target was, I suppose, to root out the terrorist network of OBL. OBL was killed in 2011.
Recently, Joe Biden said that the USA didn't go to Afghanistan for nation-building.
So, if OBL was killed in 2011 and the USA was not building the nation of Afghanistan, why did the USA stay in Afghanistan beyond 2011?