Whenever we look at a flat surface (a picture, a television screen) and assume we are looking at spaces and objects that have depth, we are accepting a set of visual signals that create an illusion of three dimensional space. 3D cues are so common today that we are almost unaware of them.
Hoover Dam, it provided western United States with much electricity
If I can get the context and possible answers, I’ll answer it for you.
These tribes subsisted on fish and sea mammals along Alaskan coast. There are some residing there today, but many have intermarried. Some are quite poor due to fisheries and large companies taking over the sustenance they need so badly. Alaska did pass an anti-discrimination law eventually, but those who chose to continue living their way are not very economically well off.
