I have a thirst for knowledge. Can someone please provide me with their knowledge of the US Government?

I am a member of the new generation. Unlike my peers, I have known of the somewhat corrupt and undemocratic nature of the US government for quite some time now. However, being a member of the new generation, and subject to the wills of the tech giants and their selective search processes, I have been stuck in an information rut. I acknowledge the existence of this rut and I ask upon the experiences and knowledge of past generations to educate me on the various transgressions and immoralities that the US government has performed, and the driving forces that have inspired said transgressions.

In simpler terms, you may all be familiar with the Iraq War, for instance. The US government started the Iraq war in order to depose a democratically-elected leader. Why? According to what I know, it was because said leader, if he were to fully assume power, would create a middle-eastern oil monopoly that would place the world economy at his mercy. This is what I know, and I understand that there is more to it than that; I want to know those details, for a general overview does not satisfy me.

The Iraq War is an example of a transgression, it is something the the US (or the government thereof) did that goes in direct conflict with the ideals upon which the nation was founded on, for the sake of some narrow-minded, greedy, or corrupt goal. I understand that the US has performed many of these over the course of modern history; I want to know more.

This is a formal request. I place high expectations on the replies and answers that will ensue. The most difficult part of this inquiry for me will be the selection of a best answer. Thank you in advance for your contribution.