What was the main reason for the war in iraq?

Oil was, in my opinion the US envied all those 3rd world countries because they are the leaders in the multi billion oil industry causing the US to weaken and loose their economy started a war with them for so called "nukes" that were never found... Aka it was to destroy their oil process so rhey can sell theirs for a more profitable business.

It can provide a social code to protect each citizen's future economical earnings. and then obviously defending the country from invading countries.