The funny thing is how very old that paranoia is. If we went back 150 years or so, there'd be the same paranoia about replacement, only instead of brown people being the source of fear, it would be the new wave of European immigrants who were gradually supplanting the old English stock. The Italians, Germans, and especially the Irish were seen as ruining the national character with their strange, foreign ways and their exotic religions (Catholicism and Lutheranism). Heck, go back far enough and you can find similar sentiments even among early waves of English protestant immigrants. If, say, you were descended from the first wave of Puritan settlers in the Plymouth colony, a second wave of immigrants, like Quaker Mary Dyer, seemed like enough of a threat to literally be hanged for it. Some things never change. Conservatism is a form of cowardice --irrational fear of change-- and it goes through the same motions, generation after generation, never learning.