After defeating the Taliban, President George W. Bush thought the US should invade Iraq. He believed that Iraq helped terrorist groups, including al-Qaeda. He said he had evidence that Iraq was also making weapons of mass destruction. He sent Secretary of State Colin Powell to the United Nations to show them some of the evidence. In March, 2003, the United States began its invasion of Iraq. (Four other countries also took part, including the United Kingdom, Australia, Poland, and Denmark.) The government of Iraq was overthrown, and the people of Iraq elected a new government. No weapons of mass destruction were found in Iraq.