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?
{'answer': 'Dred Scott v. Sandford', 'supporting_facts': [['American Insurance Co. v. 356 Bales of Cotton', 3], ['Dred Scott v. Sandford', 2]]}