romeoparker romeoparker 02-12-2020 Social Studies contestada What happened on September 11, 2001? Al-Qaeda ended American involvement in Middle Eastern countries. The US military found Osama bin Laden, the leader of al-Qaeda. The United States invaded Afghanistan to locate a terrorist group that was hiding in the country. The terrorist group al-Qaeda hijacked four American airplanes, two of which were flown into the World Trade Center in New York City.