Everyone will do it if given the chance. You think we have evolved beyond that? It’s still about grabbing more land, resources, wealth.
If one country is so significantly weaker than another, the encounter of the two usually ends in disaster for the weaker party. Their peoples killed, their cultures erased (genocide happens in more than one form).
How much atrocities happen depends on the degree of power disparity between the two.
In the case of Native Americans vs. the Europeans, you had one group living in huts fighting with ax and arrows and the other with guns and cannons. And it’s not just the Europeans. Even before the 1800, all major countries had better technology than the Native Americans.
The prerequisites of such conduct usually depends upon material factor and the status of the state itself.
For America case, it's usually due to the interest of the capital owner of the colonial power, for example in this specific occasion is the British Empire and after that the capital owner of the America itself. The whole "Manifest Destiny" shtick was a front for the expansion of the Capitalist class ownership over the productive forces of production that needed the necessary constant capital in order to fulfill their own class interest. Same could be said with Israel.
So, technological advancements has nothing to do with the constant state of oppression by a certain actors, but it is solely in the hands of the status of the state itself and the class interest they served, for this case is the bourgeois class. Meanwhile technological advancements are usually the side effects of such class expansion.