One thing I would observe about the conflicts and enmities we see today have a historical background and root which even pre-date the Cold War, although most of what's going on currently is the direct result of ill-conceived and short-sighted policies and actions during the Cold War, as well as since the Cold War. Iran, North Korea, China/Taiwan, Iraq, Afghanistan - and we're pretty much operating all over the world at this point.
I remember an argument put forth by President Reagan, when he said that during the few years after WW2 when the U.S. had a monopoly on atomic weapons, we could have used that advantage to conquer the entire world. But we didn't do that, so in his mind, that proved that the U.S. was a good, kind, and benevolent nation, dedicated only to freedom and democracy. Guys like Patton and MacArthur wanted to do precisely that, but were removed from their positions because they were seen as insubordinate and dangerous.
I've known some people among a certain sub-set of Americans who believed that it was a lost opportunity to dispense with the Communist threat once and for all. For my part, I began to wonder if the Communist threat had not been exaggerated. After all, if they were really viewed as such a grave and mortal threat, why didn't they stop them when they had the chance? They could have saved us 40 years of Cold War, and all these current conflicts caused by loose ends from the Cold War. Maybe they really weren't that much of a threat after all - or maybe our government needed there to be a threat in order to carry out their own geopolitical agenda.
When it comes to world dominance and control, history is shown us a number of would-be conquerors who made some bold advances and extended their empires far and wide. Alexander, Caesar, Genghis Khan had vast empires and a long reach. But, all gone now. I guess some people might see America and its government as a kind of "empire," but it's more like an "invisible empire." The way I see it, if we want to have an empire, then we should do it right. If we can't do that, then we have to make a deal to coexist with other empires.