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Correct Answer: C

Explanation:
Nativism in the United States, consisting of anti-immigrant sentiment and fear of foreign influence, was a major presence in politics in the 19th and early 20th centuries. Thus, a nativist attitude would be one that reflects a bias against new immigrants. This points most clearly to the anti-immigrant attitude in answer choice C, which describes immigrants as a threat to American workers--an accurate description of an attitude held by many nativists around 1900.