Final answer:
Niles' point of view, according to the historical context of the Know-Nothings' nativism, would have aligned with the American Party's stance on preserving native-born American interests against the impact of immigration.
Step-by-step explanation:
Based on the context provided, Niles' point of view would have aligned most closely with The Know-Nothings' nativism. During the early nineteenth century, the Know-Nothings were concerned primarily with the social impact of immigration and the preservation of native-born American political power.
They saw increased immigration, particularly of Irish Catholics, as a threat to American jobs, culture, and politics. The Know-Nothings were also known for their secretive nature, with members claiming 'I know nothing' when questioned about the party's activities.
This nativism reflected a desire to maintain the status quo in the face of the Market Revolution and globalization of labor markets.