The answer would be yes, but there is nothing uniquely American about that. It has been labelled politically as "Manifest Destiny" because of the racial overtones, but it really comes down to universal humanistic destiny. The answer has always been yes in any country where a more technical, educated and farming-based culture has a beachhead on a landmass that is mostly populated by a more primitive hunter-gathering culture. In any country where you have farmers vs, hunter-gatherer societies, the farmer culture wins. Farming requires land - and lots of it. If there is more to be had out there, farmers will simply go claim it, and continue to do so until the ocean stops them. Farming leads to food surplus and markets and cities. This leads to technology and industrialization, and once industrialization happens, the hunter-gathering society essentially stands no chance at all of ever being the dominant group. It is also simple human nature to sprawl, especially with large growing populations and even more so when they produce excess food supply. The darker side of American Manifest Destiny also had a race-based component unfortunately, and because the farmer-industrial group looked around and saw people that didn't look like them, act like them, nor even had a written language, the predominant white population assumed they were superior in every way, and went forth and acted accordingly.
