They didn't have the military power to defend themselves.
Imperialism because it shows the influences of other countries around the world
Protect interests of bystanders.
Native Americans were hunter-gatherers, so they saw land as hunting territory, where Europeans saw it as farmland and land to settle on. The native Americans would move around the land to hunt the animals and thus didn't claim land, but the colonist saw it as their land, so it was more important for them.
