The phrase functions as a compound proper noun, linking a specific historical event to the individual identified as its primary architect. "9/11" is the common identifier for the September 11, 2001, terrorist attacks in the United States. "Osama bin Laden" is the proper name of the founder and leader of the militant Islamist organization al-Qaeda. Grammatically, these terms are proper nouns juxtaposed to denote a direct and causal relationship: the latter is responsible for the former.
The connection was officially established through multiple intelligence sources and confirmed by the perpetrator himself. U.S. intelligence agencies, and later the 9/11 Commission Report, concluded that al-Qaeda, under bin Laden's leadership, orchestrated and financed the attacks. The operation involved 19 al-Qaeda hijackers who took control of four commercial airliners. His motivations, articulated in various fatwas and video statements, included opposition to U.S. military presence in Saudi Arabia, sanctions against Iraq, and U.S. support for Israel. While initially denying direct involvement, bin Laden later claimed responsibility in recordings released in the years following the event.
The direct linkage of this individual to the attacks became the primary justification for the subsequent U.S. foreign policy initiative known as the "War on Terror." This policy led to the 2001 invasion of Afghanistan, which aimed to dismantle al-Qaeda's base of operations and overthrow the Taliban regime that harbored its leadership. The connection also initiated a decade-long international manhunt, making him the most-wanted fugitive in the world until he was killed in a U.S. military raid in Pakistan on May 2, 2011.
