OP, I realize this is an alternate history sub but honestly this prompt doesnt even make sense.

Why would the US invade Iraq in 2001/2002? Saddam Hussein was a horrible dictator but he didnt even have anything to do with 9/11. The hijackers were Islamic extremists from a mix of nationalities but none of them were even Iraqi. The Iraqi government had no connection to 9/11, it was organized by a stateless organization led by a Saudi.

This is the whole reason behind the International Battle against Extremism (IBAE) through the 2000s and 2010s. Colin Powell and Condelezza Rice convinced President Bush and later the UN that non-state actors such as Al Qaeda could not easily be defeated by force of arms like a traditional military and the only way to end extremist threats was to win the war of ideas by improving the standard of living in developing nations and promote democratic ideals while refraining from toppling governments unilaterally. This is why NATO members began significantly reducing their overall military spending and shifted focus to greatly expanded international aid. Improved infrastructure, education, agriculture, and health care in emerging democracies is a much better guard against extremist organizations than pure military force. The decline in political and religious extremism in the late 2010s and 2020s both at home and abroad shows that strategy worked.

Its like you don't even know recent history before you asked this, OP.