Iraq invaded Kuwait in 1991. That war had broad international support, was run by smart people with a real understanding of the region and a real plan.
Bush started the Iraq war in 2003.
The plan was half assed, and the Pentagon was more interested in starting a war than in managing one.
Bush’s men told us this war would be over by Christmas and would pay for itself.
Our intelligence was not to blame, although the Bush team made a spectacle of trying to make it appear that way.
The claims that Bush made and that right wing media amplified and exaggerated all came from a former CIA front group called the Iraqi National Congress, which manufactured lurid fictional claims and fed them to Rumsfeld, Cheney, Lutti, Wolfowitz, Pearle and others in the Pentagon and the White House. When the CIA said there was little evidence, they were ordered to go back and manufacture some.
There was no Iraqi nuclear threat,
Outside the US, the world saw all these lurid claims as a smokescreen for an American oil grab. (Which was the real objective),
Contrary to your claim, the United States was not acting on behalf of the UN.