As mining became more difficult, as the claims became more difficult to find because there were more miners than there were workable claims, everyone competing and fighting for his smaller and smaller opportunity to strike it rich, you became, therefore... desirous of finding an excuse for your failure, or desirous of finding a way to get an advantage. Well one of the ways was to say, I'm an American; What are the Mexicans doing here? What are the Indians? We don't need the Indians, we can certainly get rid of them. What are the Chinese doing here? Those people shouldn't be here... This isn't their land, this is my land! This belongs to us!