Question

analyzing a fallacy
they perfectly understood the meaning of the language they used, and how it would be understood by others; and they knew that it would not in any part of the civilized world be supposed to embrace the negro race, which, by common consent, had been excluded from civilized governments and the family of nations, and doomed to slavery.
—dred scott v. sandford,
supreme court of the united states
what type of fallacy or faulty reasoning is used in this passage?
begging the claim
ad populum
genetic fallacy
hasty generalization

Explanation:

Begging the claim (petitio principii) occurs when the premise of an argument assumes the conclusion is true. In this passage, the statement "by common consent, had been excluded from civilized Governments..." assumes the exclusion (a form of the conclusion about their status) without providing independent evidence. It uses the idea of "common consent" as a premise to support the claim about exclusion and doom to slavery, but "common consent" here is a circular way of justifying the conclusion as it doesn't prove the validity of the exclusion itself. Ad populum is an appeal - to - the - people fallacy (using popularity as proof), genetic fallacy is about judging something based on its origin, and hasty generalization is making a broad conclusion from insufficient evidence. None of these fit as well as begging the claim.

Answer:

begging the claim