Perceptual constancy is known as the phenomenon by which we can perceive an object in the same way despite how far or near it is from us, that is, the phenomenon by which perception remains the same but our sensation changes. It´s also known as the Law of perception in which the intrinsic properties of objects (color, shape, size) are perceived as invariable even if the presentation conditions are modified: distance, perspective, lighting, etc.
The natives Americans were getting pushed out of their homes while the American were developing new technologies like railroads and telegraphs and expanding. They called it an invasion because it was originally the Native American's land
