Realistic conflict theory would be a good explanation for rising prejudice in this situation.
According to the realistic conflict theory, wherever there are two or more groups vying for the same few resources, there will be conflict, false preconceptions and ideas, and prejudice towards the various groups.
Just the perception of competition will foster hostile emotions and discriminating behavior in one group. For instance, whether or not it is accurate, ethnic group A will feel resentment and hatred if it perceives that members of ethnic group B are a threat to them by "taking employment."
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