Question: What case, involving an enslaved man of "the negro African race" who had been taken by his owners to free states and territories, attempted to sue for his freedom, referenced American Insurance Co. v. 356 Bales of Cotton?
Sentence (from "Dred Scott v. Sandford"): The decision was only the second time that the Supreme Court had ruled an Act of Congress to be unconstitutional.
Relevant evidence: No