Why did Americans settlers feel it was necessary to remove the American Indian?

The correct phrase to use within this question would be native Americans, but the reason that American settlers felt it was necessary to remove the native Americans from the land they were invading was because they felt that they were a threat, and would attack them for encroaching on their land and property.

The American settlers felt it was necessary to remove Native Americans because they viewed them as a threat.

My ex boyfriend ask hopes we now beyond all what in vain even