Already in the age of the cavemen, if not before, we have invaded the land of others and attempted to prevent the invasion of our own. Acquiring and protecting land and food is in animal nature and this drive serves as the primary motivation for imperialist expansion. With more land and more access to food, a particular culture may have many more opportunities to expand and thrive. Once a different land is conquered, sometimes coexistence between the indigenous peoples and the conquerors does not seem likely or possible, which leads to even deeper cultural rifts that, depending on how much power or diplomatic influence can end in genocide for the culture with less