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The invasion was not enough to create ISIS. To do that, US had to name an idiot as Iraq's governor. Enters Paul Bremer. A single decision of his made ISIS possible.

He got to manage a country that just got invaded, that used to have a huge military and where the occupiers are still fighting the remnants of rebel forces in some part of the country.

In that context, he decided that the former officers from Saddam Hussein's regime would be barred from the new Iraq military and that they should not receive pension either.

He, put yourself in their shoes: when your job is to organize a military, that the only lawful employer refused your services and denies your pension, are you going to go homeless and beg in the streets or are you going to join a rebellious startup?

The ISIS of the origin was organized just like the Baath army was, because that's the framework the officers knew. There were some documents captured (that involved less "hacking" than physical invasion of command structures but of course we never know the amount of covert ops going on) and what they revealed was that one budget line was the biggest of the whole organization: pensions. Suicide bombing is not the career path everybody chose there.

ISIS is not a US creation: that would imply GWB's administration capacity to plan such a thing. But it came from crucial mistakes the US did despite being warned about these years prior.