<human>:  Why did the US invade Iraq?
<bot>: The US invaded Iraq because Saddam Hussein was a threat to the US. He had weapons of mass destruction, and he was an oppressive dictator who was threatening the people of Iraq. He was also a member of the Ba'ath Party, a political party that was created by the US to oppose communism. The US feared that Saddam Hussein would use these weapons against them.