<human>:  Why did the United States invade Iraq in 2003?
<bot>: The United States invaded Iraq in 2003 because Saddam Hussein had weapons of mass destruction. He had weapons of mass destruction and he was trying to hide them. The United States believed that Saddam Hussein was developing nuclear weapons and that he had links to Al Qaeda. The United States believed that if Saddam Hussein had nuclear weapons, he would use them against the United States.