That's how it's been for as long as I've been alive, although I've also seen active challenges, along with resistance and defiance, to that kind of thinking. It was more prevalent in the 60s, 70s, and early 80s, but by the late 80s/early 90s, it had subsided. One thing that caught my attention was when Oliver Stone's JFK came out, there was somewhat of a backlash from the elite, who seemed to be quite upset and angry that Stone was bringing up questions and issues they were probably hoping would go away or be forgotten.
Reminds me of a song lyric from The Cult:
War, she's a whore
Don't you know we love her more and more?
U.S. war policies since WW2 have focused not so much on acquiring new territories as much as defending territories and governments which are/were part of the so-called "free world," which essentially meant the part of the world which was within the Western fold. That's why the Communist Bloc was viewed as such a grave threat, especially as European colonial hegemony was collapsing and pro-communist insurgencies were popping up all over.
One common theme throughout history is the fact that most societies are hierarchical in that a few people tend to hold most of the wealth and power at the top, while continually working to find new and inventive ways to be able to keep that wealth and power - even though the peasants are far more numerous and could easily overthrow them if they acted collectively. But it wasn't really until the rise of industrialism that this became a far more complicated and difficult challenge, since cities became larger and more populated than the world had ever seen before.
This had grown quite apparent, especially after the Revolutions of 1848. One could say the elite probably got a serious wake-up call. Nationalistic leaders such as Bismarck and Napoleon III realized that, no matter what, they have to find ways to feed the masses and keep their people reasonably content. That's how many of the first social programs came into being. But they didn't want them to be merely content. They didn't want "tame cattle" but something more akin to fiercely loyal wolves who would fight for them and conquer other lands.