(Jim McMahon)

Within a month of the September 11 attacks, the U.S. would go to war to find and punish the people responsible. In October 2001, U.S. troops invaded Afghanistan, where Al Qaeda, the terrorist group behind the attacks, was based. In 2003, the United States invaded Iraq. President Bush believed that the dictator of that country, Saddam Hussein, posed a terrorist threat. U.S. troops are still active in both countries. In May 2011, Al Qaeda leader Osama bin Laden was killed in a U.S. military operation. He was hiding in a compound in Abbottabad, Pakistan.

Click here to read more about the events of September 11, 2001 in a Scholastic News Online Special Report, “Remembering 9/11.”