I have always appreciated your realism Korimyr, but surely even you can appreciate that your views on the "nature" of human civilizations have been formed through an Amero-centric lens. All of the things you describe are the natures of your nation. Not all nations are warlike and there are those which live in relative peace. Your view presumes that the human consciousness does not evolve with time; that the way you see nationhood in modern day America is the way that all nations and cultures see it, past and present. We can draw conclusions about some basic human natures, sure, but that glosses over many efforts throughout the ages to change our ways. The fact that we often fall back on primitive impulses is clear, but only honing on that is precluding the fact that there are many people who want it to be better, and who want the world to be a better place. Every human evolution is slow and takes time, but the desire to change starts with a single idea, and the idea spreads.
The way the world is now, with its interconnectedness and complex interdependence -- it has NEVER been this way before in all of our known world history. The mentality of conquer or be conquered doesn't fully apply anymore. I know it does to many Americans, and that brings me back to my original point: the fact that you are American shapes your view on this. Your nation is warlike, it thrives on conflicts, and it creates many of them; the many "natures" you state are, in many ways, American apologism for state behaviour.
Christopher Columbus day may be a misguided tradition, but it's a carry-over from the era when most of the nations in power truly did think the way you are describing. It's not a eutopia now by any means but I don't see any point in maintaining a lie under the guise that it's the glue that holds nations together. It isn't. Nations remain in tact because people work out of mutual interest, and in case you haven't noticed, your nation has at least two potentially fatal problems right now, one of which is epidemic, non-sustainable selfishness.