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Since you weren't specific on what war you meant, I'll go over the most significant recent ones.
Iraq had a list of problems, most notably debt from the war with Iran, believing Kuwait was stealing its oil (there is an oil field straddling the border between Iraq and Kuwait), and the belief that Kuwait should be a part of Iraq but was stolen away by the UK and made into its own state when Iraq refused to build a train line in the early 20th century. As a result Iraq invaded Kuwait, and was repelled by the UN coalition led by the US.
The US perceived Iraq as a potential threat due to perceived WMD projects, and invaded, deposing Saddam Hussein and beginning a long occupation with the goal of setting up a Western friendly democratic government.