What made recent European immigrants the ready targets of more established city dwellers? What was the result of this discrimination?

The new demand for workers spurred a massive influx of job-seekers from both rural areas of the United States and from eastern and southern Europe. Urban housing—as well as services such as transportation and sanitation—expanded accordingly, though cities struggled to cope with the surging demand.

Explanation:

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the term is einsatzgruppen

demand is the need and oportunity to buy a given good or service.