Why were the Know-Nothings unable to curb the political influence of Irish immigrants?

Question

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Voting rights in the United States during the time of the Know-Nothings (mid-19th century) were primarily determined by race and gender, not by religion or nationality. This meant that Irish immigrants, being white, were often able to vote upon meeting other criteria such as residency, which allowed them to maintain or even grow their political influence despite the efforts of nativist groups like the Know-Nothings.

Why Were the Know-Nothings Unable to Curb the Political Influence