Well, Saddam was originally a puppet regime for the U.S. that rebelled. The Shah (king) of Iran was just a puppet for the U.S. until 1979 and its population rebelled. Iraq invaded Iran because of a plot by the U.S. since they lost their puppet from Iran. Oil is the reason.
The U.S. gains nothing from an independent Middle-East, so if they cannot control then they try to ruin instead.
When they attacked Iraq they saw that their puppet Saddam was not filling their agenda so they sought to make a liberation to replace it with another. What is better than making sure a Shia-dominated government takes control?
The ulterior goal seems very hard to see, but there are economic powers which are not the U.S government but mega-corporations who have enormous power influence working in the shadows. The U.S government is in return a puppet of these corporations. So if the puppets around the world are for U.S, then the U.S government is a puppet for those who work in the shadows. They are everywhere, even in the Congress or Senate. They are totally everywhere wherever they can get their foot in. They control banks, they control resources, they control money. If you have that you can control everything with those resources, especially if you are organised (see documentaries about secrets meetings of world's most influential people where the mighty families like Rothschild are present). American media is controlled by those people.
Salaam
The shah was well and right deposed by the imperialists. The shah himself was rather malomaniac and egolatric and it was obvious that he had not character of "puppet" or servant and Iran was becoming too powerful and ambitious for the imperials. He had to go. And for that they were keeping in Paris a time bomb in the form of Khomeini. They planned to destroy Iran from the inside with a nuts religious regime and internal strife. But the ayatolas, whatever others faults they may have had, fools they were not and they rid the tide to this day. Also the war procured between Iran and Iraq did not destroy either of them. And there comes the difference between Saddam and the ayatolas. Saddam was had pushing him into attacking Kuwait. That was his most damning error. You cannot believe the imperials they are devils. As simle as that. No honour no word, everybody for them is shit. They are the real all time version of shaytan. They despise, hate people. People for them are worse than cattle. They are preys.
And imperials are not a nation. They are a club which has sapped the life of nations.
That is where we are now.
Salaam