[specialist]

What measure of proof do you require?

One would have to be fantastically incredulous to imagine the USA invaded Iraq for anything other than the loot.

As @yesenadam notes, there's mountains of evidence, readily visible to anyone choosing to notice.

On your point of commercial interests, as though there's a distinction from trade policy, Saddam and Gadaffi had the poor sense to seriously propose abandoning petrodollars, sealing their fates.