If you think that USA's invasion of Iraq was reactive, then go read up about the think tank "Project for the New American Century", and compare their goals and their list of members against that of the GWB administration.

Wikipedia article: <https://en.wikipedia.org/wiki/Project_for_the_New_American_C...>

This may look like a made-up conspiracy theory, but everything was public, in the open on their official web site at the time (link at the bottom to copy on archive.org). (Oh boy, am I going to get downvoted for this ...)