What caused anti-immigrant sentiment to increase in the united states during the 1800s?
political differences
overcrowded cities
competition in the workplace
competition in social circles

competition in the workplace

Explanation:

With the immigrants coming and the rural areas needing less and less workers thanks to the technological advances of the time, the only thing that happened was that there was too many people willing to work and needing a job, so the wages became lower because there was too much offer of workers and only so many jobs, that made the anti-immifrant sentimient to increase because there were already too many workers and people in the US and were unemployed and adding more and more people to that offer wasn´t convenient for the ones that were already here.

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explanation:

norsemen from northern countries had made earlier journeys